Property:Phenology

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Abelmoschus esculentus +
Flowering spring–fall.  +
Abietinella abietina +
Capsules mature late summer.  +
Abildgaardia ovata +
Fruiting all year.  +
Abronia alpina +
Flowering summer.  +
Abronia ameliae +
Flowering winter–spring.  +
Abronia ammophila +
Flowering summer–fall.  +
Abronia angustifolia +
Flowering spring–fall.  +
Abronia argillosa +
Flowering spring–summer.  +
Abronia bigelovii +
Flowering fall.  +
Abronia bolackii +
Flowering spring–summer.  +
Abronia carletonii +
Flowering spring–fall.  +
Abronia elliptica +
Flowering spring–fall.  +
Abronia fragrans +
Flowering spring–fall.  +
Abronia latifolia +
Flowering spring–summer.  +
Abronia macrocarpa +
Flowering spring, opportunistically after summer rains.  +
Abronia maritima +
Flowering year-round.  +
Abronia mellifera +
Flowering spring–fall.  +
Abronia nana var. covillei +
Flowering spring–fall.  +
Abronia nana var. nana +
Flowering spring–fall.  +
Abronia pogonantha +
Flowering spring–summer.  +
Abronia turbinata +
Flowering spring–fall.  +
Abronia umbellata var. acutalata +
Flowering spring–fall.  +
Abronia umbellata var. breviflora +
Flowering year-round.  +
Abronia umbellata var. umbellata +
Flowering year-round.  +
Abronia villosa var. aurita +
Flowering year-round.  +
Abronia villosa var. villosa +
Flowering winter–summer.  +
Abutilon abutiloides +
Flowering year-round.  +
Abutilon berlandieri +
Flowering year-round.  +
Abutilon coahuilae +
Flowering year-round.  +
Abutilon fruticosum +
Flowering year-round.  +
Abutilon hirtum +
Flowering year-round.  +
Abutilon hulseanum +
Flowering winter–spring.  +
Abutilon hypoleucum +
Flowering spring–fall.  +
Abutilon incanum +
Flowering spring–fall.  +
Abutilon malacum +
Flowering summer.  +
Abutilon mollicomum +
Flowering late summer.  +
Abutilon palmeri +
Flowering late winter–spring.  +
Abutilon parishii +
Flowering late summer.  +
Abutilon parvulum +
Flowering spring–fall.  +
Abutilon permolle +
Flowering year-round.  +
Abutilon reventum +
Flowering late summer.  +
Abutilon theophrasti +
Flowering summer–fall.  +
Abutilon trisulcatum +
Flowering winter–spring.  +
Abutilon wrightii +
Flowering spring–fall.  +
Acaena novae-zelandiae +
Flowering May–Jun.  +
Acaena pallida +
Flowering May–Jun.  +
Acaena pinnatifida +
Flowering Mar–Jun.  +
Acalypha alopecuroidea +
Flowering and fruiting late summer–fall.  +
Acalypha arvensis +
Flowering and fruiting summer–fall.  +
Acalypha australis +
Flowering and fruiting late summer–fall.  +
Acalypha californica +
Flowering and fruiting year-round, especially spring and fall.  +
Acalypha chamaedrifolia +
Flowering and fruiting year-round, mainly spring–fall.  +
Acalypha deamii +
Flowering and fruiting late summer–fall.  +
Acalypha gracilens +
Flowering and fruiting mostly summer–fall.  +
Acalypha monococca +
Flowering and fruiting summer–fall.  +
Acalypha monostachya +
Flowering and fruiting spring–fall.  +
Acalypha neomexicana +
Flowering and fruiting late summer–fall.  +
Acalypha ostryifolia +
Flowering and fruiting summer–fall.  +
Acalypha phleoides +
Flowering and fruiting spring–fall.  +
Acalypha poiretii +
Flowering and fruiting late summer–fall.  +
Acalypha radians +
Flowering and fruiting spring–fall.  +
Acalypha rhomboidea +
Flowering and fruiting summer–fall.  +
Acalypha setosa +
Flowering and fruiting summer–fall.  +
Acalypha virginica +
Flowering and fruiting summer–fall.  +
Acalypha wilkesiana +
Flowering spring–fall.  +
Acamptopappus shockleyi +
Flowering Apr–Jun.  +
Acamptopappus sphaerocephalus var. hirtellus +
Flowering Apr–Jun.  +
Acamptopappus sphaerocephalus var. sphaerocephalus +
Flowering Mar–Jun.  +
Acanthocereus tetragonus +
Flowering mid summer–fall.  +
Acanthoscyphus parishii var. abramsii +
Flowering Jun–Aug.  +
Acanthoscyphus parishii var. cienegensis +
Flowering Jun–Sep.  +
Acanthoscyphus parishii var. goodmaniana +
Flowering May–Sep.  +
Acanthoscyphus parishii var. parishii +
Flowering Jun–Oct.  +
Acanthospermum australe +
Flowering year round, mostly Jul–Aug.  +
Acanthospermum hispidum +
Flowering year round, mostly Aug–Oct.  +
Acanthospermum humile +
Flowering all year.  +
Acaulon muticum var. muticum +
Capsules mature late fall to spring.  +
Acaulon muticum var. rufescens +
Capsules mature late fall to early spring.  +
Acaulon schimperianum +
Capsules mature winter.  +
Acaulon triquetrum +
Capsules mature late autumn-spring.  +
Achillea alpina +
Flowering early Jul–early Sep.  +
Achillea millefolium +
Flowering late Apr–early Jul (south), mid Jul–mid Sep (north).  +
Achillea nobilis +
Flowering mid Jul–early Sep.  +
Achillea ptarmica +
Flowering late Jun–mid Sep.  +
Achlys californica +
Flowering spring–summer (Apr–Jul).  +
Achlys triphylla +
Flowering spring–summer (Apr–Jul).  +
Achyrachaena mollis +
Flowering Mar–Jun.  +
Achyranthes aspera var. aspera +
Flowering summer.  +
Achyranthes aspera var. pubescens +
Flowering summer.  +
Achyranthes japonica +
Flowering summer.  +
Achyronychia cooperi +
Flowering spring.  +
Acleisanthes acutifolia +
Flowering spring–fall.  +
Acleisanthes angustifolia +
Flowering late spring–early fall.  +
Acleisanthes anisophylla +
Flowering spring–fall.  +
Acleisanthes chenopodioides +
Flowering late spring–early fall.  +
Acleisanthes crassifolia +
Flowering spring–fall.  +
Acleisanthes diffusa +
Flowering late spring–late summer.  +
Acleisanthes lanceolata var. lanceolata +
Flowering late spring–early fall.  +
Acleisanthes longiflora +
Flowering Feb–Nov.  +
Acleisanthes nevadensis +
Flowering spring–summer.  +
Acleisanthes obtusa +
Flowering early spring–late fall.  +
Acleisanthes parvifolia +
Flowering late spring–early fall.  +
Acleisanthes wrightii +
Flowering spring–fall.  +
Acmella pusilla +
Flowering May–Sep.  +
Acmella repens +
Flowering Jan–Dec.  +
Acoelorraphe wrightii +
Flowering spring–summer.  +
Aconitum columbianum subsp. columbianum +
Flowering summer (Jul–Sep).  +
Aconitum columbianum subsp. viviparum +
Flowering summer (Jul–Sep).  +
Aconitum delphiniifolium +
Flowering summer (mid Jun–Sep).  +
Aconitum maximum subsp. maximum +
Flowering summer (mid Jul–Sep).  +
Aconitum reclinatum +
Flowering late spring–summer (Jun–Sep).  +
Aconitum uncinatum +
Flowering late summer (mid Aug-late Sep).  +
Aconogonon alaskanum var. alaskanum +
Flowering Jun–Aug.  +
Aconogonon alaskanum var. glabrescens +
Flowering Jun–Aug.  +
Aconogonon davisiae var. davisiae +
Flowering Jun–Aug.  +
Aconogonon davisiae var. glabrum +
Flowering Jun–Aug.  +
Aconogonon phytolaccifolium var. glabrum +
Flowering Jun–Aug.  +
Aconogonon phytolaccifolium var. phytolaccifolium +
Flowering Jun–Aug.  +
Acorus americanus +
Flowering late spring–mid summer.  +
Acorus calamus +
Flowering early spring–early summer.  +
Acourtia microcephala +
Flowering May–Jul.  +
Acourtia nana +
Flowering (Mar–)Apr(–Jun).  +
Acourtia runcinata +
Flowering year round (mostly Mar–Aug).  +
Acourtia thurberi +
Flowering Oct–Nov.  +
Acourtia wrightii +
Flowering Jun–Nov.  +
Acrocomia totai +
Flowering in the summer.  +
Acroporium smallii +
Capsules mature summer.  +
Acroptilon repens +
Flowering late spring–summer (May–Sep).  +
Acrostichum aureum +
Sporulating all year.  +
Actaea pachypoda +
Flowering spring–early summer.  +
Actaea rubra +
Flowering spring–early summer.  +
Adelia vaseyi +
Flowering Jan–Jun, fruiting Jun.  +
Adenocaulon bicolor +
Flowering Jun–Oct.  +
Adenophyllum cooperi +
Flowering spring–fall.  +
Adenophyllum porophylloides +
Flowering spring and fall.  +
Adenophyllum wrightii var. wrightii +
Flowering fall.  +
Adenostoma fasciculatum var. fasciculatum +
Flowering (Apr–)May–Jun(–Aug).  +
Adenostoma fasciculatum var. obtusifolium +
Flowering (Apr–)May–Jun(–Aug).  +
Adenostoma fasciculatum var. prostratum +
Flowering (Apr–)May–Jun(–Aug).  +
Adenostoma sparsifolium +
Flowering Jul–Aug(–Sep).  +
Adiantum aleuticum +
Sporulating summer–fall.  +
Adiantum capillus-veneris +
Sporulating spring–summer.  +
Adiantum hispidulum +
Sporulating summer–fall.  +
Adiantum jordanii +
Sporulating early spring–midsummer.  +
Adiantum melanoleucum +
Sporulating throughout the year.  +
Adiantum pedatum +
Sporulating summer–fall.  +
Adiantum tenerum +
Sporulating throughout the year.  +
Adiantum tricholepis +
Sporulating late winter–early spring.  +
Adiantum viridimontanum +
Sporulating summer–fall.  +
Adlumia fungosa +
Flowering summer–early fall.  +
Adolphia californica +
Flowering Dec–Apr(–May).  +
Adolphia infesta +
Flowering Mar–Aug(–Sep).  +
Adonis aestivalis +
Flowering spring–summer (May–Jul).  +
Adonis annua +
Flowering spring–summer (Apr–Jun).  +
Adonis vernalis +
Flowering spring (Apr–May).  +
Aeonium arboreum var. arboreum +
Flowering spring.  +
Aeonium haworthii +
Flowering late spring.  +
Agalinis aphylla +
Flowering early Sep–mid Oct.  +
Agalinis aspera +
Flowering Jul–Sep.  +
Agalinis auriculata +
Flowering Aug–Sep.  +
Agalinis caddoensis +
Flowering Oct.  +
Agalinis calycina +
Flowering Aug–Sep.  +
Agalinis decemloba +
Flowering Aug–mid Oct.  +
Agalinis densiflora +
Flowering Aug–Sep.  +
Agalinis divaricata +
Flowering early Sep–mid Oct.  +
Agalinis edwardsiana +
Flowering Aug–Oct.  +
Agalinis fasciculata +
Flowering year-round.  +
Agalinis filicaulis +
Flowering mid Sep–early Nov.  +
Agalinis filifolia +
Flowering Jun–Nov.  +
Agalinis flexicaulis +
Flowering Sep–late Oct.  +
Agalinis gattingeri +
Flowering mid Aug–Oct.  +
Agalinis georgiana +
Flowering late Aug–late Sep(–Oct).  +
Agalinis harperi +
Flowering late Sep–Oct.  +
Agalinis heterophylla +
Flowering late Aug–early Oct.  +
Agalinis homalantha +
Flowering late Aug–early Oct.  +
Agalinis laxa +
Flowering Sep–Oct.  +
Agalinis linifolia +
Flowering late Aug–early Oct.  +
Agalinis maritima var. grandiflora +
Flowering year-round.  +
Agalinis maritima var. maritima +
Flowering Jul–Sep.  +
Agalinis navasotensis +
Flowering Sep–Oct.  +
Agalinis neoscotica +
Flowering late Jul–early Sep.  +
Agalinis obtusifolia +
Flowering Sep–late Oct.  +
Agalinis oligophylla +
Flowering late Sep–mid Nov.  +
Agalinis plukenetii +
Flowering late Sep–early Nov.  +
Agalinis pulchella +
Flowering Sep–early Oct.  +
Agalinis purpurea var. parviflora +
Flowering Jul–Sep.  +
Agalinis purpurea var. purpurea +
Flowering Aug–Oct.  +
Agalinis setacea +
Flowering Aug–Oct.  +
Agalinis skinneriana +
Flowering Aug–early Oct.  +
Agalinis strictifolia +
Flowering mid Jul–Oct.  +
Agalinis tenella +
Flowering Sep–Oct.  +
Agalinis tenuifolia +
Flowering (late Jul–)Aug–Nov.  +
Agalinis viridis +
Flowering late Aug–Oct.  +
Agarista populifolia +
Flowering early spring–spring.  +
Agave americana subsp. protamericana +
Flowering early spring–early summer.  +
Agave americana var. americana +
Flowering mid spring–early summer.  +
Agave americana var. expansa +
Flowering late spring–early summer.  +
Agave asperrima var. asperrima +
Flowering late spring–summer.  +
Agave chrysantha +
Flowering late spring–summer.  +
Agave decipiens +
Flowering mid fall–early winter.  +
Agave delamateri +
Flowering early summer.  +
Agave deserti var. deserti +
Flowering spring.  +
Agave deserti var. simplex +
Flowering spring.  +
Agave desmettiana +
Flowering late spring–early summer.  +
Agave gracilipes +
Flowering summer–early fall.  +
Agave havardiana +
Flowering summer–early fall.  +
Agave lechuguilla +
Flowering mid spring–late summer.  +
Agave mckelveyana +
Flowering mid spring–mid summer.  +
Agave murpheyi +
Flowering late winter–spring.  +
Agave neglecta +
Flowering early summer.  +
Agave palmeri +
Flowering late spring–summer.  +
Agave parryi subsp. neomexicana +
Flowering mid spring–early summer.  +
Agave parryi var. couesii +
Flowering late spring–early summer.  +
Agave parryi var. huachucensis +
Flowering mid spring–early summer.  +
Agave parryi var. parryi +
Flowering mid spring–mid summer.  +
Agave parviflora subsp. parviflora +
Flowering late spring–late summer.  +
Agave phillipsiana +
Flowering early summer.  +
Agave schottii var. schottii +
Flowering late spring–late summer.  +
Agave schottii var. treleasei +
Flowering late spring–summer.  +
Agave shawii var. shawii +
Flowering winter–mid spring.  +
Agave sisalana +
Flowering winter–early spring.  +
Agave toumeyana var. bella +
Flowering late spring.  +
Agave toumeyana var. toumeyana +
Flowering late spring–summer.  +
Agave univittata +
Flowering spring.  +
Agave utahensis subsp. kaibabensis +
Flowering mid spring–early summer.  +
Agave utahensis var. eborispina +
Flowering late winter–spring.  +
Agave utahensis var. nevadensis +
Flowering late winter–early summer  +
Agave utahensis var. utahensis +
Flowering late winter–early summer.  +
Agave weberi +
Flowering late spring–early summer.  +
Agave ×ajoensis +
Flowering late spring–summer.  +
Agave ×arizonica +
Flowering mid spring–early summer.  +
Agave ×glomeruliflora +
Flowering mid spring–early fall.  +
Agdestis clematidea +
Flowering summer–fall.  +
Ageratina adenophora +
Flowering Mar–Aug(–Sep).  +
Ageratina altissima var. altissima +
Flowering Jul–Oct(–Nov).  +
Ageratina altissima var. roanensis +
Flowering Jul–Oct.  +
Ageratina aromatica +
Flowering late Aug–Oct(–Nov).  +
Ageratina havanensis +
Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.  +
Ageratina herbacea +
Flowering (Jul–)Aug–Oct.  +
Ageratina jucunda +
Flowering (Sep–)Oct–Dec(–Jan).  +
Ageratina lemmonii +
Flowering Aug–Oct.  +
Ageratina luciae-brauniae +
Flowering Aug–Oct.  +
Ageratina occidentalis +
Flowering (Jun–)Jul–Sep.  +
Ageratina paupercula +
Flowering Mar–May.  +
Ageratina rothrockii +
Flowering (Jul–)Aug–Oct.  +
Ageratina shastensis +
Flowering Jun–Oct.  +
Ageratina thyrsiflora +
Flowering Sep–Nov.  +
Ageratina wrightii +
Flowering (Jul–)Aug–Oct(–Nov).  +
Ageratum conyzoides +
Flowering Jul–Aug.  +
Ageratum corymbosum +
Flowering Jul–Oct.  +
Ageratum houstonianum +
Flowering Jun–Aug.  +
Ageratum maritimum +
Flowering year round.  +
Agnorhiza bolanderi +
Flowering Mar–Apr(–May).  +
Agnorhiza elata +
Flowering Jun–Jul(–Aug).  +
Agnorhiza invenusta +
Flowering Jun–Jul.  +
Agnorhiza ovata +
Flowering May–Jul(–Aug).  +
Agnorhiza reticulata +
Flowering May–Jun.  +
Agoseris apargioides var. apargioides +
Flowering Apr–May (year-round).  +
Agoseris apargioides var. eastwoodiae +
Flowering April–May (year-round).  +
Agoseris apargioides var. maritima +
Flowering Jul–Aug.  +
Agoseris aurantiaca var. aurantiaca +
Flowering Jun–Sep.  +
Agoseris aurantiaca var. purpurea +
Flowering Jun–Sep.  +
Agoseris glauca var. dasycephala +
Flowering Jul–Aug.  +
Agoseris glauca var. glauca +
Flowering May–Sep.  +
Agoseris grandiflora var. grandiflora +
Flowering Mar–Oct.  +
Agoseris grandiflora var. leptophylla +
Flowering Mar–Oct.  +
Agoseris heterophylla var. cryptopleura +
Flowering Mar–Sep.  +
Agoseris heterophylla var. heterophylla +
Flowering Mar–Sep.  +
Agoseris heterophylla var. quentinii +
Flowering Mar–Jun.  +
Agoseris hirsuta +
Flowering mostly Apr–Jun, rarely Sep–Dec.  +
Agoseris monticola +
Flowering Jul–Aug.  +
Agoseris parviflora +
Flowering Apr–Aug.  +
Agoseris retrorsa +
Flowering Apr–Aug.  +
Agoseris ×elata +
Flowering Jun–Sep.  +
Agrimonia gryposepala +
Flowering Jul–mid Aug[–Mar].  +
Agrimonia incisa +
Flowering late Jul–Nov.  +
Agrimonia microcarpa +
Flowering late Jul–Sep.  +
Agrimonia parviflora +
Flowering mid Jul–early Sep.  +
Agrimonia pubescens +
Flowering mid Jul–Sep.  +
Agrimonia rostellata +
Flowering Jul–mid Sep.  +
Agrimonia striata +
Flowering late Jun–Aug(–mid Sep).  +
Agrostemma githago var. githago +
Flowering spring–summer.  +
Akebia quinata +
Flowering spring, fruiting fall (Sep–Oct).  +
Alcea rosea +
Flowering May–Oct  +, fruiting Jun–Oct.  +
Alcea rugosa +
Flowering May–Oct  +, fruiting Jun–Oct.  +
Alchemilla alpina +
Flowering mid Jun–mid Sep.  +
Alchemilla filicaulis subsp. filicaulis +
Flowering late Jun–Sep.  +
Alchemilla filicaulis subsp. vestita +
Flowering late Jun–Aug.  +
Alchemilla glabra +
Flowering Jul–Aug.  +
Alchemilla glaucescens +
Flowering Jun–Aug.  +
Alchemilla glomerulans +
Flowering late Jun–Sep.  +
Alchemilla micans +
Flowering late May–Sep.  +
Alchemilla mollis +
Flowering late Jul–Sep.  +
Alchemilla monticola +
Flowering late May–Sep.  +
Alchemilla subcrenata +
Flowering Jun–Sep.  +
Alchemilla venosa +
Flowering late Jun–Aug.  +
Alchemilla wichurae +
Flowering Jul.  +
Alchemilla xanthochlora +
Flowering late May–Sep.  +
Aletris aurea +
Flowering late spring–mid summer.  +
Aletris bracteata +
Flowering year round.  +
Aletris farinosa +
Flowering late spring–mid summer.  +
Aletris lutea +
Flowering spring.  +
Aletris obovata +
Flowering late spring–mid summer.  +
Alisma gramineum +
Flowering summer–fall.  +
Alisma lanceolatum +
Flowering and fruiting summer–fall.  +
Alisma plantago-aquatica +
Flowering and fruiting late summer.  +
Alisma subcordatum +
Flowering spring–fall.  +
Alisma triviale +
Flowering spring–fall.  +
Alkekengi officinarum +
Flowering Jun–Aug.  +
Allamanda cathartica +
Flowering spring–fall  +, fruiting summer–fall.  +
Allenrolfea occidentalis +
Flowering mid summer–late fall.  +
Alliaria petiolata +
Flowering Apr–May.  +
Allionia choisyi +
Flowering late spring–early fall [year-round].  +
Allionia incarnata var. incarnata +
Flowering year-round, primarily early spring–late fall.  +
Allionia incarnata var. villosa +
Flowering early spring–late fall [year-round].  +
Allium aaseae +
Flowering Apr–May.  +
Allium abramsii +
Flowering May–Jul.  +
Allium acuminatum +
Flowering Apr–Jul.  +
Allium ampeloprasum +
Flowering Apr–Jul.  +
Allium amplectens +
Flowering Apr–Jul.  +
Allium anceps +
Flowering Apr–May.  +
Allium atrorubens var. atrorubens +
Flowering May–Jun.  +
Allium atrorubens var. cristatum +
Flowering late Apr–Jun.  +
Allium bigelovii +
Flowering late Mar–May.  +
Allium bisceptrum +
Flowering May–Jul.  +
Allium bolanderi var. bolanderi +
Flowering late May–early Aug.  +
Allium bolanderi var. mirabile +
Flowering late May–early Jul.  +
Allium brandegeei +
Flowering late Apr–Jul.  +
Allium brevistylum +
Flowering Jun–Aug.  +
Allium burlewii +
Flowering late Apr–Jul.  +
Allium campanulatum +
Flowering late May–Aug.  +
Allium canadense var. canadense +
Flowering Apr–Jul.  +
Allium canadense var. ecristatum +
Flowering Mar–early Apr.  +
Allium canadense var. fraseri +
Flowering Apr–Jun.  +
Allium canadense var. hyacinthoides +
Flowering late Mar–Apr.  +
Allium canadense var. lavendulare +
Flowering May–Jul.  +
Allium canadense var. mobilense +
Flowering Apr–May.  +
Allium cepa +
Flowering Jun–Aug.  +
Allium cernuum +
Flowering Jul–Oct.  +
Allium columbianum +
Flowering May–Jul.  +
Allium constrictum +
Flowering May–Jul.  +
Allium coryi +
Flowering Apr–May.  +
Allium cratericola +
Flowering Mar–Jun.  +
Allium crenulatum +
Flowering late May–Jul.  +
Allium crispum +
Flowering late Mar–Jun.  +
Allium cuthbertii +
Flowering May–early Jun.  +
Allium denticulatum +
Flowering mid Apr–mid Jul.  +
Allium diabolense +
Flowering mid Apr–Jun.  +
Allium dichlamydeum +
Flowering May–Jul.  +
Allium dictuon +
Flowering Jun–Jul.  +
Allium douglasii +
Flowering May–Jul.  +
Allium drummondii +
Flowering Mar–Jun.  +
Allium elmendorfii +
Flowering Mar–early Apr.  +
Allium falcifolium +
Flowering Apr–Jun.  +
Allium fibrillum +
Flowering May–Jul.  +
Allium fimbriatum var. fimbriatum +
Flowering Apr–Jun.  +
Allium fimbriatum var. mohavense +
Flowering Apr–May.  +
Allium fimbriatum var. purdyi +
Flowering late Apr–Jun.  +
Allium fistulosum +
Flowering Jul–Aug.  +
Allium geyeri var. geyeri +
Flowering May–Sep.  +
Allium geyeri var. tenerum +
Flowering May–Sep.  +
Allium gooddingii +
Flowering Jun–Sep.  +
Allium haematochiton +
Flowering Mar–May.  +
Allium hickmanii +
Flowering Mar–May.  +
Allium hoffmanii +
Flowering Jun–Jul.  +
Allium howellii var. clokeyi +
Flowering May–Jun.  +
Allium howellii var. howellii +
Flowering Mar–Apr.  +
Allium howellii var. sanbenitense +
Flowering Apr–May.  +
Allium hyalinum +
Flowering Mar–May.  +
Allium jepsonii +
Flowering late May–early Jul.  +
Allium kunthii +
Flowering Jul–Sep.  +
Allium lacunosum var. davisiae +
Flowering Apr–May.  +
Allium lacunosum var. kernensis +
Flowering Apr–May.  +
Allium lacunosum var. lacunosum +
Flowering Apr–Jun.  +
Allium lacunosum var. micranthum +
Flowering Apr–Jun.  +
Allium lemmonii +
Flowering May–Jun.  +
Allium macropetalum +
Flowering late Mar–Jun.  +
Allium macrum +
Flowering Apr–May.  +
Allium madidum +
Flowering May–Jul.  +
Allium membranaceum +
Flowering May–Jun.  +
Allium monticola +
Flowering late May–Jul.  +
Allium munzii +
Flowering Apr–mid May.  +
Allium neapolitanum +
Flowering Mar–Apr.  +
Allium nevadense +
Flowering Apr–Jun.  +
Allium nevii +
Flowering May–Jul.  +
Allium nigrum +
Flowering Jun.  +
Allium obtusum var. conspicuum +
Flowering May–Jun.  +
Allium obtusum var. obtusum +
Flowering May–Jun.  +
Allium oleraceum +
Flowering late Jul–Aug.  +
Allium paniculatum var. paniculatum +
Flowering Jun–Jul.  +
Allium parishii +
Flowering Apr–May.  +
Allium parryi +
Flowering May–Jul.  +
Allium parvum +
Flowering late Apr–Jun.  +
Allium passeyi +
Flowering Jun.  +
Allium peninsulare var. franciscanum +
Flowering May–Jun.  +
Allium peninsulare var. peninsulare +
Flowering Apr–May.  +
Allium perdulce var. perdulce +
Flowering Apr–Jun.  +
Allium perdulce var. sperryi +
Flowering Mar–Apr.  +
Allium platycaule +
Flowering May–Jun.  +
Allium plummerae +
Flowering Jun–Sep.  +
Allium praecox +
Flowering Mar–May.  +
Allium punctum +
Flowering May–Jun.  +
Allium rhizomatum +
Flowering Jul–Sep.  +
Allium robinsonii +
Flowering Apr–May.  +
Allium rotundum +
Flowering May–Jul.  +
Allium runyonii +
Flowering Mar–Apr.  +
Allium sanbornii var. congdonii +
Flowering Jun–Jul.  +
Allium sanbornii var. sanbornii +
Flowering late Jun–Aug.  +
Allium sativum var. sativum +
Flowering Jun–Jul.  +
Allium schoenoprasum +
Flowering Jun–Aug.  +
Allium scilloides +
Flowering Mar–Apr.  +
Allium serra +
Flowering Apr–May.  +
Allium sharsmithiae +
Flowering Apr–May.  +
Allium shevockii +
Flowering Jun–Jul.  +
Allium simillimum +
Flowering Apr–Jun.  +
Allium siskiyouense +
Flowering late Apr–Jun.  +
Allium speculae +
Flowering Jun.  +
Allium stellatum +
Flowering Jul–Oct.  +
Allium textile +
Flowering May–Jun.  +
Allium tolmiei var. persimile +
Flowering Apr–Jul.  +
Allium tolmiei var. tolmiei +
Flowering Apr–Jul.  +
Allium tribracteatum +
Flowering Mar–May.  +
Allium tricoccum var. burdickii +
Flowering early Jun.  +
Allium tricoccum var. tricoccum +
Flowering Jul–Aug.  +
Allium triquetrum +
Flowering Mar–Apr.  +
Allium tuberosum +
Flowering Jul–Aug.  +
Allium tuolumnense +
Flowering Mar–May.  +
Allium unifolium +
Flowering May–Jun.  +
Allium validum +
Flowering Jun–Aug.  +
Allium victorialis +
Flowering Jul–Aug.  +
Allium vineale +
Flowering Jun–Aug.  +
Allium yosemitense +
Flowering May–Jun.  +
Allotropa virgata +
Flowering late spring–summer.  +
Allowissadula holosericea +
Flowering May–Nov.  +
Allowissadula lozanoi +
Flowering May–Oct.  +
Almutaster pauciflorus +
Flowering spring–fall.  +
Alnus alnobetula subsp. crispa +
Flowering spring.  +
Alnus alnobetula subsp. fruticosa +
Flowering spring.  +
Alnus alnobetula subsp. sinuata +
Flowering spring.  +
Alnus glutinosa +
Flowering early spring.  +
Alnus incana subsp. rugosa +
Flowering early spring.  +
Alnus incana subsp. tenuifolia +
Flowering early spring.  +
Alnus maritima +
Flowering late summer–early fall.  +
Alnus oblongifolia +
Flowering early spring.  +
Alnus rhombifolia +
Flowering early spring.  +
Alnus rubra +
Flowering early spring.  +
Alnus serrulata +
Flowering early spring.  +
Aloe vera +
Flowering spring–winter, occasionally at other times.  +
Aloe ×schonlandii +
Flowering spring.  +
Aloina aloides var. ambigua +
Capsules mature Jan–May.  +
Aloina bifrons +
Capsules mature Jan–Jul(-Aug).  +
Aloina brevirostris +
Capsules mature (Mar-)May–Aug.  +
Aloina hamulus +
Sporophytes unknown in flora area.  +
Aloina rigida var. rigida +
Capsules mature Jun–Aug(-Oct).  +
Alophia drummondii +
Flowering mostly May–Jul(–Sep).  +
Alpinia zerumbet +
Flowering spring–summer (May–Sep).  +
Alsia californica +
Capsules mature spring.  +
Alstonia macrophylla +
Flowering winter–spring  +, fruiting spring–summer.  +
Alstonia scholaris +
Flowering fall  +, fruiting material not seen.  +
Alstroemeria pulchella +
Flowering mid spring–early summer.  +
Alternanthera brasiliana +
Flowering spring.  +
Alternanthera caracasana +
Flowering summer–fall.  +
Alternanthera ficoidea var. bettzickiana +
Flowering late winter.  +
Alternanthera flavescens +
Flowering year-round.  +
Alternanthera maritima +
Flowering winter–spring.  +
Alternanthera paronychioides +
Flowering spring–late fall, year-round in far south.  +
Alternanthera philoxeroides +
Flowering early spring–summer.  +
Alternanthera pungens +
Flowering summer–fall.  +
Alternanthera sessilis +
Flowering summer–early fall.  +
Althaea armeniaca +
Flowering summer–fall.  +
Althaea cannabina +
Flowering summer.  +
Althaea hirsuta +
Flowering spring–summer.  +
Althaea officinalis +
Flowering summer–fall.  +
Alvaradoa amorphoides subsp. psilophylla +
Flowering and fruiting year-round.  +
Alyssum alyssoides +
Flowering May–Jul.  +
Alyssum desertorum +
Flowering Apr–Jul.  +
Alyssum murale +
Flowering May–Jul.  +
Alyssum obovatum +
Flowering May–Jul.  +
Alyssum simplex +
Flowering Apr–Jun.  +
Alyssum szowitsianum +
Flowering May.  +
Amaranthus acanthochiton +
Flowering summer–fall.  +
Amaranthus albus +
Flowering summer–fall.  +
Amaranthus arenicola +
Flowering summer–fall.  +
Amaranthus australis +
Flowering summer–fall.  +
Amaranthus blitoides +
Flowering summer–fall.  +
Amaranthus blitum +
Flowering summer–fall (almost year-round in tropics, subtropics).  +
Amaranthus californicus +
Flowering summer–fall.  +
Amaranthus cannabinus +
Flowering summer–fall.  +
Amaranthus caudatus +
Flowering summer–fall.  +
Amaranthus crassipes +
Flowering summer and fall.  +
Amaranthus crispus +
Flowering summer–fall.  +
Amaranthus cruentus +
Flowering summer–fall.  +
Amaranthus deflexus +
Flowering summer–fall.  +
Amaranthus dubius +
Flowering summer–fall in tropics, various seasons in subtropics.  +
Amaranthus fimbriatus +
Flowering summer–fall (in arid regions mostly after summer rains).  +
Amaranthus floridanus +
Flowering late spring–fall.  +
Amaranthus graecizans +
Flowering summer–fall.  +
Amaranthus greggii +
Flowering summer–fall.  +
Amaranthus hybridus +
Flowering summer–fall.  +
Amaranthus hypochondriacus +
Flowering summer–fall.  +
Amaranthus muricatus +
Flowering summer–fall.  +
Amaranthus obcordatus +
Flowering summer–fall.  +
Amaranthus palmeri +
Flowering summer–fall, occasionally spring–winter in southern part of its native range.  +
Amaranthus polygonoides +
Flowering summer–fall.  +
Amaranthus powellii +
Flowering summer–fall.  +
Amaranthus pumilus +
Flowering summer–fall.  +
Amaranthus retroflexus +
Flowering summer–fall.  +
Amaranthus scleropoides +
Flowering summer–fall.  +
Amaranthus spinosus +
Flowering summer–fall.  +
Amaranthus tamaulipensis +
Flowering spring–fall.  +
Amaranthus thunbergii +
Flowering summer–fall.  +
Amaranthus torreyi +
Flowering summer–fall.  +
Amaranthus tricolor +
Flowering summer–fall.  +
Amaranthus tuberculatus +
Flowering summer–fall.  +
Amaranthus viridis +
Flowering summer–fall.  +
Amaranthus viscidulus +
Flowering summer–fall.  +
Amaranthus watsonii +
Flowering late winter–spring, summer–fall.  +
Amaranthus wrightii +
Flowering summer–fall.  +
Amauriopsis dissecta +
Flowering (Jun–)Aug–Sep(–Oct).  +
Amberboa moschata +
Flowering winter–early summer (Jan–Jul).  +
Amblyolepis setigera +
Flowering (Jan–)Mar–May(–Sep).  +
Amblyopappus pusillus +
Flowering spring.  +
Ambrosia acanthicarpa +
Flowering (Apr–)Jul–Nov.  +
Ambrosia ambrosioides +
Flowering Mar–May.  +
Ambrosia artemisiifolia +
Flowering Jul–Oct.  +
Ambrosia bidentata +
Flowering Jul–Oct.  +
Ambrosia chamissonis +
Flowering Apr–Nov.  +
Ambrosia cheiranthifolia +
Flowering Jun–Nov.  +
Ambrosia chenopodiifolia +
Flowering Mar–Apr.  +
Ambrosia confertiflora +
Flowering (May–)Sep–Dec.  +
Ambrosia cordifolia +
Flowering Mar–Apr.  +
Ambrosia deltoidea +
Flowering Feb–May.  +
Ambrosia dumosa +
Flowering Mar–May(–Dec).  +
Ambrosia eriocentra +
Flowering Apr–May(–Jul).  +
Ambrosia grayi +
Flowering Aug–Sep.  +
Ambrosia hispida +
Flowering Apr.  +
Ambrosia ilicifolia +
Flowering Jan–Apr.  +
Ambrosia linearis +
Flowering Jul.  +
Ambrosia monogyra +
Flowering (May–)Aug–Nov.  +
Ambrosia psilostachya +
Flowering Jul–Oct(–Dec).  +
Ambrosia pumila +
Flowering May–Jun(–Oct).  +
Ambrosia salsola +
Flowering Mar–May(–Jun).  +
Ambrosia tomentosa +
Flowering Jun–Sep.  +
Ambrosia trifida +
Flowering Jul–Nov.  +
Amelanchier alnifolia var. alnifolia +
Flowering May–Jul  +, fruiting Jul–Aug.  +
Amelanchier alnifolia var. pumila +
Flowering May–Jun  +, fruiting Jul–Sep.  +
Amelanchier alnifolia var. semiintegrifolia +
Flowering Mar–Jun  +, fruiting Jun–Aug.  +
Amelanchier amabilis +
Flowering May–Jun  +, fruiting Jul–Aug.  +
Amelanchier arborea +
Flowering Feb–May  +, fruiting May–Jul.  +
Amelanchier bartramiana +
Flowering May–Aug  +, fruiting Jul–Sep.  +
Amelanchier canadensis var. canadensis +
Flowering Mar–May  +, fruiting Jun–Jul.  +
Amelanchier canadensis var. obovalis +
Flowering Mar–May  +, fruiting May–Jun.  +
Amelanchier cusickii +
Flowering Mar–Jul  +, fruiting May–Aug.  +
Amelanchier fernaldii +
Flowering Jun–Jul  +, fruiting Jul–Aug.  +
Amelanchier gaspensis +
Flowering May–Jun  +, fruiting Jul–Sep.  +
Amelanchier humilis +
Flowering Apr–May  +, fruiting Jul–Aug.  +
Amelanchier interior +
Flowering May–Jun  +, fruiting Jul–Aug.  +
Amelanchier intermedia +
Flowering May–Jun  +, fruiting Jun–Aug.  +
Amelanchier laevis +
Flowering Apr–Jun  +, fruiting Jun–Jul.  +
Amelanchier nantucketensis +
Flowering Mar–May  +, fruiting Jun–Jul.  +
Amelanchier nitens +
Flowering Apr–Jun  +, fruiting Jun–Jul.  +
Amelanchier pallida +
Flowering Apr–Jun  +, fruiting Jul–Sep.  +
Amelanchier sanguinea +
Flowering May–Jun  +, fruiting Jul–Aug.  +
Amelanchier spicata +
Flowering Apr–Jun  +, fruiting Jul–Aug.  +
Amelanchier utahensis +
Flowering Apr–May  +, fruiting Jul–Sep.  +
Amerorchis rotundifolia +
Flowering Jun–Jul.  +
Amianthium muscitoxicum +
Flowering late spring–summer.  +
Ammannia auriculata +
Flowering late spring–late fall.  +
Ammannia coccinea +
Flowering late spring–late fall.  +
Ammannia grayi +
Flowering late spring–fall (May–Sep).  +
Ammannia latifolia +
Flowering late spring–late fall.  +
Ammannia robusta +
Flowering late spring–late fall.  +
Amoreuxia gonzalezii +
Flowering Jul–Sep.  +
Amoreuxia palmatifida +
Flowering Jun–Sep  +, fruiting Jul–Oct.  +
Amoreuxia wrightii +
Flowering May–Jul(–Oct).  +
Ampelaster carolinianus +
Flowering peak late fall–winter, year round (Fla).  +
Ampelopsis aconitifolia +
Flowering May–Aug  +, fruiting Jun–Oct.  +
Ampelopsis cordata +
Flowering late Apr–Jun  +, fruiting Jul–Sep.  +
Ampelopsis glandulosa +
Flowering late May–Jul  +, fruiting Jul–Oct.  +
Amphiachyris amoena +
Flowering late Sep–Oct.  +
Amphiachyris dracunculoides +
Flowering Jul–Nov.  +
Amphipappus fremontii var. fremontii +
Flowering Mar–May.  +
Amphipappus fremontii var. spinosus +
Flowering Mar–May.  +
Amphiscirpus nevadensis +
Fruiting summer.  +
Amsonia arenaria +
Flowering spring  +, fruiting summer.  +
Amsonia ciliata var. ciliata +
Flowering spring  +, fruiting summer.  +
Amsonia ciliata var. filifolia +
Flowering spring  +, fruiting summer.  +
Amsonia ciliata var. texana +
Flowering spring  +, fruiting summer.  +
Amsonia fugatei +
Flowering late spring  +, fruiting late spring–early summer.  +
Amsonia grandiflora +
Flowering spring (rarely summer)  +, fruiting summer.  +
Amsonia hubrichtii +
Flowering spring  +, fruiting summer.  +
Amsonia jonesii +
Flowering spring  +, fruiting summer.  +
Amsonia kearneyana +
Flowering spring  +, fruiting summer.  +
Amsonia longiflora var. longiflora +
Flowering spring(–summer)  +, fruiting (spring–)summer(–fall).  +
Amsonia longiflora var. salpignantha +
Flowering spring  +, fruiting summer.  +
Amsonia ludoviciana +
Flowering spring(–early summer)  +, fruiting summer.  +
Amsonia palmeri +
Flowering spring  +, fruiting late spring–summer.  +
Amsonia peeblesii +
Flowering spring–early summer  +, fruiting summer.  +
Amsonia rigida +
Flowering spring  +, fruiting early summer to summer.  +
Amsonia tabernaemontana var. illustris +
Flowering spring (rarely summer)  +, fruiting summer (rarely fall).  +
Amsonia tabernaemontana var. repens +
Flowering spring  +, fruiting summer.  +
Amsonia tabernaemontana var. salicifolia +
Flowering spring(–early summer)  +, fruiting summer(–fall).  +
Amsonia tabernaemontana var. tabernaemontana +
Flowering spring  +, fruiting summer.  +
Amsonia tharpii +
Flowering spring  +, fruiting late spring–summer.  +
Amsonia tomentosa var. stenophylla +
Flowering spring  +, fruiting early summer.  +
Amsonia tomentosa var. tomentosa +
Flowering spring  +, fruiting late spring–summer.  +
Anacamptodon splachnoides +
Capsules mature (Jan-)Apr–Oct(-Dec).  +
Anacolia menziesii +
Capsules mature Feb–Aug.  +
Anagallis arvensis +
Flowering spring–summer.  +
Anagallis minima +
Flowering spring–fall.  +
Anagallis monelli +
Flowering spring–fall.  +
Anagallis pumila +
Flowering spring–early winter.  +
Anaphalis margaritacea +
Flowering Jul–Oct (sporadically longer).  +
Ancistrocactus brevihamatus +
Flowering Jan–Mar.  +
Ancistrocactus scheeri +
Flowering Nov–Mar.  +
Ancistrocarphus filagineus +
Flowering and fruiting mid Mar–late Jun.  +
Ancistrocarphus keilii +
Flowering and fruiting Mar–Apr.  +
Andreaeobryum macrosporum +
Capsules mature late summer.  +
Andromeda polifolia var. latifolia +
Flowering May–Jul(-Sep)  +, fruiting Jun–Sep.  +
Andromeda polifolia var. polifolia +
Flowering May–Aug  +, fruiting Jun–Sep.  +
Androsace chamaejasme subsp. lehmanniana +
Flowering summer.  +
Androsace elongata subsp. acuta +
Flowering early-mid summer.  +
Androsace filiformis +
Flowering early-mid summer.  +
Androsace occidentalis +
Flowering early-mid summer.  +
Androsace septentrionalis +
Flowering spring–early fall.  +
Androstephium breviflorum +
Flowering spring (Mar–Jun).  +
Androstephium coeruleum +
Flowering spring (Feb–May).  +
Anelsonia eurycarpa +
Flowering Jun–Jul.  +
Anemone acutiloba +
Flowering spring.  +
Anemone americana +
Flowering spring.  +
Anemone berlandieri +
Flowering winter–spring (Feb–Apr).  +
Anemone canadensis +
Flowering spring–summer (May–Aug).  +
Anemone caroliniana +
Flowering winter–spring (Feb–Apr).  +
Anemone cylindrica +
Flowering summer (Jun–Jul).  +
Anemone deltoidea +
Flowering spring–summer (Apr–Jul).  +
Anemone drummondii var. drummondii +
Flowering summer (Jun–Aug).  +
Anemone drummondii var. lithophila +
Flowering summer (Jun–Aug).  +
Anemone edwardsiana var. edwardsiana +
Flowering winter–spring (Feb–Apr).  +
Anemone edwardsiana var. petraea +
Flowering winter–spring (Feb–Apr).  +
Anemone grayi +
Flowering winter–early summer (Feb–Jun).  +
Anemone lancifolia +
Flowering spring–summer (Apr–Jun).  +
Anemone lyallii +
Flowering spring–summer (Mar–Jul).  +
Anemone multiceps +
Flowering spring–summer (May–Jul).  +
Anemone multifida var. multifida +
Flowering spring–summer (Apr–Jul).  +
Anemone multifida var. saxicola +
Flowering summer (Jun–Aug).  +
Anemone multifida var. stylosa +
Flowering summer (Jul–Aug).  +
Anemone multifida var. tetonensis +
Flowering spring–summer (Mar–Aug).  +
Anemone narcissiflora var. monantha +
Flowering spring–summer (May–Jul).  +
Anemone narcissiflora var. villosissima +
Flowering spring–summer (May–Aug).  +
Anemone narcissiflora var. zephyra +
Flowering summer (Jun–Aug).  +
Anemone occidentalis +
Flowering spring–summer (May–Aug/Sep).  +
Anemone okennonii +
Flowering spring (Mar–Apr).  +
Anemone oregana var. felix +
Flowering spring (Apr–Jun).  +
Anemone oregana var. oregana +
Flowering spring (Mar–Jun).  +
Anemone parviflora +
Flowering spring–summer (May–Aug).  +
Anemone patens var. multifida +
Flowering spring–summer (Apr–Aug).  +
Anemone piperi +
Flowering spring–summer (Apr–Aug).  +
Anemone quinquefolia var. minima +
Flowering spring (Apr–May).  +
Anemone quinquefolia var. quinquefolia +
Flowering spring–early summer (Mar–Jun).  +
Anemone richardsonii +
Flowering spring–summer (May–Aug).  +
Anemone tuberosa +
Flowering spring (Apr–May).  +
Anemone virginiana var. alba +
Flowering spring–summer (May–Jul).  +
Anemone virginiana var. cylindroidea +
Flowering summer (Jun–Aug).  +
Anemone virginiana var. virginiana +
Flowering summer (Jun–Aug).  +
Anemopsis californica +
Flowering early spring–summer.  +
Angadenia berteroi +
Flowering spring–summer  +, fruiting spring–fall.  +
Angelonia gardneri +
Flowering May–Oct.  +
Aniseia martinicensis +
Flowering Aug–Nov.  +
Anisocarpus madioides +
Flowering Apr–Sep.  +
Anisocarpus scabridus +
Flowering Jun–Sep.  +
Anisocoma acaulis +
Flowering Mar–May.  +
Annona glabra +
Flowering spring–early summer.  +
Annona squamosa +
Flowering spring–early summer.  +
Anoda abutiloides +
Flowering spring–fall.  +
Anoda crenatiflora +
Flowering fall.  +
Anoda cristata +
Flowering summer–fall.  +
Anoda lanceolata +
Flowering summer–fall.  +
Anoda pentaschista +
Flowering late summer–mid winter.  +
Anoda reticulata +
Flowering late summer.  +
Anoda thurberi +
Flowering late summer–early fall.  +
Anomobryum concinnatum +
Capsules mature Jul–Sep.  +
Anomobryum julaceum +
Capsules mature Jun–Sep.  +
Anomodon attenuatus +
Capsules mature early-mid fall.  +
Anomodon minor +
Capsules mature early fall.  +
Anomodon rostratus +
Capsules mature early-mid fall.  +
Anomodon rugelii +
Capsules mature mid fall.  +
Anomodon viticulosus +
Capsules mature early-mid fall.  +
Anredera cordifolia +
Flowering late summer–fall.  +
Anredera vesicaria +
Flowering late summer–fall.  +
Antennaria alpina +
Flowering mid–late summer.  +
Antennaria anaphaloides +
Flowering summer.  +
Antennaria arcuata +
Flowering summer.  +
Antennaria argentea +
Flowering summer.  +
Antennaria aromatica +
Flowering mid summer.  +
Antennaria corymbosa +
Flowering early–mid summer.  +
Antennaria densifolia +
Flowering summer.  +
Antennaria dimorpha +
Flowering early–mid spring.  +
Antennaria dioica +
Flowering summer.  +
Antennaria flagellaris +
Flowering mid–late spring.  +
Antennaria friesiana subsp. alaskana +
Flowering summer.  +
Antennaria friesiana subsp. friesiana +
Flowering summer.  +
Antennaria friesiana subsp. neoalaskana +
Flowering summer.  +
Antennaria geyeri +
Flowering summer.  +
Antennaria howellii subsp. canadensis +
Flowering mid spring–early summer.  +
Antennaria howellii subsp. howellii +
Flowering mid spring–early summer.  +
Antennaria howellii subsp. neodioica +
Flowering mid spring–early summer.  +
Antennaria howellii subsp. petaloidea +
Flowering mid spring–early summer.  +
Antennaria lanata +
Flowering summer.  +
Antennaria luzuloides subsp. aberrans +
Flowering summer.  +
Antennaria luzuloides subsp. luzuloides +
Flowering summer.  +
Antennaria marginata +
Flowering summer.  +
Antennaria media +
Flowering summer.  +
Antennaria microphylla +
Flowering early–mid summer.  +
Antennaria monocephala subsp. angustata +
Flowering summer.  +
Antennaria monocephala subsp. monocephala +
Flowering summer.  +
Antennaria neglecta +
Flowering early–mid spring.  +
Antennaria parlinii subsp. fallax +
Flowering early–mid spring.  +
Antennaria parlinii subsp. parlinii +
Flowering early–mid spring.  +
Antennaria parvifolia +
Flowering late spring–summer.  +
Antennaria plantaginifolia +
Flowering mid–late spring.  +
Antennaria pulchella +
Flowering summer.  +
Antennaria pulcherrima subsp. eucosma +
Flowering summer.  +
Antennaria pulcherrima subsp. pulcherrima +
Flowering summer.  +
Antennaria racemosa +
Flowering summer.  +
Antennaria rosea subsp. arida +
Flowering summer.  +
Antennaria rosea subsp. confinis +
Flowering summer.  +
Antennaria rosea subsp. pulvinata +
Flowering summer.  +
Antennaria rosea subsp. rosea +
Flowering summer.  +
Antennaria rosulata +
Flowering summer.  +
Antennaria soliceps +
Flowering summer.  +
Antennaria solitaria +
Flowering early–mid spring.  +
Antennaria stenophylla +
Flowering in late spring–early summer.  +
Antennaria suffrutescens +
Flowering early summer.  +
Antennaria umbrinella +
Flowering summer.  +
Antennaria virginica +
Flowering early–mid spring.  +
Anthemis arvensis +
Flowering May–Jul(–Sep).  +
Anthemis cotula +
Flowering (Apr–)May–Aug(–Oct).  +
Antigonon leptopus +
Flowering year-round.  +
Antirrhinum majus +
Flowering May–Oct.  +
Anulocaulis annulatus +
Flowering late winter–late summer, occasionally mid fall.  +
Anulocaulis eriosolenus +
Flowering late spring-mid fall.  +
Anulocaulis leiosolenus var. gypsogenus +
Flowering late spring–early fall.  +
Anulocaulis leiosolenus var. howardii +
Flowering late spring–early fall.  +
Anulocaulis leiosolenus var. lasianthus +
Flowering late spring–early fall.  +
Anulocaulis leiosolenus var. leiosolenus +
Flowering late spring–early fall.  +
Anulocaulis reflexus +
Flowering late spring–early fall.  +
Aongstroemia longipes +
Capsules mature late summer.  +
Apacheria chiricahuensis +
Flowering Apr–Nov.  +
Aphanes arvensis +
Flowering Apr–May.  +
Aphanes australis +
Flowering Mar–May.  +
Aphanes occidentalis +
Flowering Mar–Jun.  +
Aphanisma blitoides +
Flowering summer–early fall.  +
Aphanorrhegma serratum +
Capsules mature (Jul) Sep–Dec.  +
Aphanostephus pilosus +
Flowering May–Jul.  +
Aphanostephus ramosissimus var. humilis +
Flowering Apr–Jun(–Oct).  +
Aphanostephus ramosissimus var. ramosissimus +
Flowering (Feb–)Apr–Jul(–Sep).  +
Aphanostephus riddellii +
Flowering Mar–Aug(–Oct).  +
Aphanostephus skirrhobasis var. kidderi +
Flowering Mar–Jun(–Aug).  +
Aphanostephus skirrhobasis var. skirrhobasis +
Flowering (Mar–)Apr–Jul(–Aug).  +
Aphanostephus skirrhobasis var. thalassius +
Flowering (Feb–)Apr–Dec.  +
Aphragmus eschscholtzianus +
Flowering Jun–Jul.  +
Aplectrum hyemale +
Flowering late spring.  +
Aplodon wormskioldii +
Capsules mature summer.  +
Apocynum androsaemifolium +
Flowering spring–summer  +, fruiting summer–fall.  +
Apocynum cannabinum +
Flowering summer–fall  +, fruiting summer–fall.  +
Apocynum ×floribundum +
Flowering summer–fall  +, fruiting summer–fall.  +
Apodanthera undulata var. undulata +
Flowering May–Sep.  +
Aponogeton distachyos +
Flowering late winter–spring (Mar–Apr), fall (Oct–Nov).  +
Aptenia cordifolia +
Flowering spring–fall.  +
Apteria aphylla +
Flowering late summer–fall.  +
Aquilegia barnebyi +
Flowering summer (Jun–Jul).  +
Aquilegia brevistyla +
Flowering summer (Jun–Aug).  +
Aquilegia canadensis +
Flowering spring–summer (Mar–Jun).  +
Aquilegia chaplinei +
Flowering summer (Jul–Aug).  +
Aquilegia chrysantha +
Flowering spring–summer (Apr–Sep).  +
Aquilegia coerulea var. alpina +
Flowering summer (Jun–Aug).  +
Aquilegia coerulea var. coerulea +
Flowering summer (mid Jun-early Sep).  +
Aquilegia coerulea var. ochroleuca +
Flowering summer (late Jun–Aug).  +
Aquilegia coerulea var. pinetorum +
Flowering spring–summer (May–Sep).  +
Aquilegia desertorum +
Flowering spring–fall (May–Oct).  +
Aquilegia elegantula +
Flowering spring–summer (May–Jul).  +
Aquilegia eximia +
Flowering spring–summer (May–Aug).  +
Aquilegia flavescens +
Flowering summer (Jun–Aug).  +
Aquilegia formosa var. formosa +
Flowering spring–summer (Apr–Aug).  +
Aquilegia formosa var. hypolasia +
Flowering summer (Jun–Aug).  +
Aquilegia formosa var. truncata +
Flowering spring–summer (Apr–Aug).  +
Aquilegia hinckleyana +
Flowering spring (Mar–Apr).  +
Aquilegia jonesii +
Flowering summer (Jun–Jul).  +
Aquilegia laramiensis +
Flowering summer (Jun–Jul).  +
Aquilegia longissima +
Flowering summer (Jul–Sep).  +
Aquilegia micrantha +
Flowering spring–summer (Apr–Sep).  +
Aquilegia pubescens +
Flowering summer (Jun–Aug).  +
Aquilegia saximontana +
Flowering summer (Jul–Aug).  +
Aquilegia scopulorum +
Flowering summer (Jun–Aug).  +
Aquilegia shockleyi +
Flowering spring–summer (Apr–Aug).  +
Aquilegia vulgaris +
Flowering spring–summer (May–Jul).  +
Arabidopsis arenicola +
Flowering Jun–Aug.  +
Arabidopsis arenosa subsp. arenosa +
Flowering Jul.  +
Arabidopsis lyrata subsp. kamchatica +
Flowering Jun–Jul.  +
Arabidopsis lyrata subsp. lyrata +
Flowering Apr–Jul.  +
Arabidopsis lyrata subsp. petraea +
Flowering Jun–Jul.  +
Arabidopsis thaliana +
Flowering Feb–May.  +
Arabis aculeolata +
Flowering Mar–May(-Jun).  +
Arabis alpina +
Flowering Jun–Aug.  +
Arabis blepharophylla +
Flowering Mar–Apr.  +
Arabis caucasica +
Flowering Jun–Aug.  +
Arabis crucisetosa +
Flowering Apr–Jun.  +
Arabis eschscholtziana +
Flowering (Apr-)May–Jul.  +
Arabis furcata +
Flowering May–Jul(-Aug).  +
Arabis georgiana +
Flowering Mar–Apr.  +
Arabis mcdonaldiana +
Flowering May–Jun.  +
Arabis modesta +
Flowering Mar–Apr(-May).  +
Arabis nuttallii +
Flowering Apr–Aug.  +
Arabis olympica +
Flowering Aug.  +
Arabis oregana +
Flowering Apr–May.  +
Arabis patens +
Flowering Apr–May.  +
Arabis pycnocarpa var. adpressipilis +
Flowering Mar–Jun.  +
Arabis pycnocarpa var. pycnocarpa +
Flowering Mar–Jul.  +
Araujia odorata +
Flowering summer–fall  +, fruiting fall–winter.  +
Araujia sericifera +
Flowering summer–fall  +, fruiting fall–winter.  +
Arbutus arizonica +
Flowering May–Jun(-Aug)  +, fruiting Aug–Oct.  +
Arbutus menziesii +
Flowering Mar–May(-Jun)  +, fruiting (Jun-)Jul–Sep (-Oct) (fruit sometimes held on the trees into early part of following year).  +
Arbutus xalapensis +
Flowering (Feb-)Mar–Apr(-May)  +, ripe fruit appears after about 6 weeks.  +
Arceuthobium americanum +
Flowering (Mar–)Apr–Jun  +, fruiting Aug–Sep.  +
Arceuthobium campylopodum subsp. abietinum +
Flowering Jul–Aug(–Sep)  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. apachecum +
Flowering Jul–Sep  +, fruiting Aug–Oct.  +
Arceuthobium campylopodum subsp. blumeri +
Flowering Jul–Aug  +, fruiting Aug–Oct.  +
Arceuthobium campylopodum subsp. californicum +
Flowering Jul–Aug  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. campylopodum +
Flowering Aug–Oct  +, fruiting Sep–Nov.  +
Arceuthobium campylopodum subsp. cyanocarpum +
Flowering Jul–Sep  +, fruiting Aug–Sep.  +
Arceuthobium campylopodum subsp. laricis +
Flowering Jul–Aug  +, fruiting (Aug–)Sep(–Oct).  +
Arceuthobium campylopodum subsp. littorum +
Flowering Aug–Sep  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. microcarpum +
Flowering (Jul–)Aug–Sep  +, fruiting (Aug–)Sep(–Oct).  +
Arceuthobium campylopodum subsp. monticola +
Flowering Jul–Aug  +, fruiting Oct–Nov.  +
Arceuthobium campylopodum subsp. occidentale +
Flowering Sep–Nov(–Dec)  +, fruiting (Sep–)Oct–Jan(–Feb).  +
Arceuthobium campylopodum subsp. siskiyouense +
Flowering Aug–Sep  +, fruiting Sep–Oct.  +
Arceuthobium campylopodum subsp. tsugense +
Flowering Jul–Sep(–Oct)  +, fruiting (Aug–)Sep–Nov.  +
Arceuthobium divaricatum +
Flowering Aug–Sep  +, fruiting Sep–Oct.  +
Arceuthobium douglasii +
Flowering (Mar–)Apr–May(–Jun)  +, fruiting Aug–Sep(–Oct).  +
Arceuthobium gillii +
Flowering Feb–Apr  +, fruiting Oct.  +
Arceuthobium pusillum +
Flowering (Mar–)Apr–May(–Jun)  +, fruiting Sep–Oct.  +
Arceuthobium vaginatum subsp. cryptopodum +
Flowering (Apr–)May–Jun(–Jul)  +, fruiting Jul–Aug(–Sep).  +
Archidium alternifolium +
Capsules mature late fall to early spring (Nov–Mar).  +
Archidium donnellii +
Capsules mature early spring (Mar), more rarely in autumn or winter (Oct–Dec).  +
Archidium hallii +
Capsules mature early spring (Mar) or rarely late fall (Nov).  +
Archidium minus +
Capsules mature fall to spring (Sep–Apr).  +
Archidium ohioense +
Capsules mature fall through spring (Oct–May).  +
Archidium tenerrimum +
Capsules mature late fall to early spring (Oct–Mar).  +
Arctanthemum arcticum subsp. arcticum +
Flowering summer.  +
Arctanthemum arcticum subsp. polare +
Flowering summer.  +
Arctium lappa +
Flowering summer–early fall (Jul–Oct).  +
Arctium minus +
Flowering summer–early fall (Jul–Sep).  +
Arctium tomentosum +
Flowering summer–early fall (Jul–Oct).  +
Arctoa anderssonii +
Capsules mature summer.  +
Arctoa fulvella +
Capsules mature summer.  +
Arctoa hyperborea +
Capsules mature summer.  +
Arctomecon californica +
Flowering mid spring  +, fruiting early summer.  +
Arctomecon humilis +
Flowering late spring  +, fruiting mid summer.  +
Arctomecon merriamii +
Flowering mid spring  +, fruiting early summer.  +
Arctostaphylos andersonii +
Flowering winter–early spring.  +
Arctostaphylos auriculata +
Flowering winter–early spring.  +
Arctostaphylos bakeri subsp. bakeri +
Flowering winter–early spring.  +
Arctostaphylos bakeri subsp. sublaevis +
Flowering winter–early spring.  +
Arctostaphylos canescens subsp. canescens +
Flowering early winter–late spring.  +
Arctostaphylos canescens subsp. sonomensis +
Flowering early winter–late spring.  +
Arctostaphylos catalinae +
Flowering winter–early spring.  +
Arctostaphylos columbiana +
Flowering winter–early spring.  +
Arctostaphylos confertiflora +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. crinita +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. crustacea +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. eastwoodiana +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. insulicola +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. rosei +
Flowering winter–early spring.  +
Arctostaphylos crustacea subsp. subcordata +
Flowering winter–early spring.  +
Arctostaphylos cruzensis +
Flowering winter–early spring.  +
Arctostaphylos densiflora +
Flowering winter–early spring.  +
Arctostaphylos edmundsii +
Flowering winter–early spring.  +
Arctostaphylos franciscana +
Flowering winter–early spring.  +
Arctostaphylos gabilanensis +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. adamsii +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. crassifolia +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. cushingiana +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. gabrielensis +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. glandulosa +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. howellii +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. leucophylla +
Flowering winter–early spring.  +
Arctostaphylos glandulosa subsp. mollis +
Flowering winter–early spring.  +
Arctostaphylos glauca +
Flowering winter–early spring.  +
Arctostaphylos glutinosa +
Flowering winter–early spring.  +
Arctostaphylos hispidula +
Flowering winter–early spring.  +
Arctostaphylos hookeri subsp. hearstiorum +
Flowering winter–early spring.  +
Arctostaphylos hookeri subsp. hookeri +
Flowering winter–early spring.  +
Arctostaphylos hooveri +
Flowering winter–early spring.  +
Arctostaphylos imbricata +
Flowering winter–early spring.  +
Arctostaphylos insularis +
Flowering winter–early spring.  +
Arctostaphylos klamathensis +
Flowering late spring.  +
Arctostaphylos luciana +
Flowering winter–early spring.  +
Arctostaphylos malloryi +
Flowering winter–late spring.  +
Arctostaphylos manzanita subsp. elegans +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. glaucescens +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. laevigata +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. manzanita +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. roofii +
Flowering winter–early spring.  +
Arctostaphylos manzanita subsp. wieslanderi +
Flowering early–late spring.  +
Arctostaphylos mewukka subsp. mewukka +
Flowering late spring–early summer.  +
Arctostaphylos mewukka subsp. truei +
Flowering late spring–early summer.  +
Arctostaphylos montana subsp. montana +
Flowering late spring.  +
Arctostaphylos montana subsp. ravenii +
Flowering early–late spring.  +
Arctostaphylos montaraensis +
Flowering winter–early spring.  +
Arctostaphylos montereyensis +
Flowering winter–early spring.  +
Arctostaphylos morroensis +
Flowering winter–early spring.  +
Arctostaphylos myrtifolia +
Flowering winter–early spring.  +
Arctostaphylos nevadensis subsp. knightii +
Flowering late spring.  +
Arctostaphylos nevadensis subsp. nevadensis +
Flowering late spring.  +
Arctostaphylos nissenana +
Flowering winter–early spring.  +
Arctostaphylos nortensis +
Flowering late winter–late spring.  +
Arctostaphylos nummularia subsp. mendocinoensis +
Flowering winter–early spring.  +
Arctostaphylos nummularia subsp. nummularia +
Flowering winter–early spring.  +
Arctostaphylos obispoensis +
Flowering winter–early spring.  +
Arctostaphylos ohloneana +
Flowering winter–early spring.  +
Arctostaphylos osoensis +
Flowering winter–early spring.  +
Arctostaphylos otayensis +
Flowering winter–early spring.  +
Arctostaphylos pacifica +
Flowering winter–early spring.  +
Arctostaphylos pajaroensis +
Flowering early winter–early spring.  +
Arctostaphylos pallida +
Flowering winter–early spring.  +
Arctostaphylos parryana subsp. desertica +
Flowering winter–early spring.  +
Arctostaphylos parryana subsp. parryana +
Flowering late spring–early summer.  +
Arctostaphylos parryana subsp. tumescens +
Flowering early–late spring.  +
Arctostaphylos patula +
Flowering late spring–early summer.  +
Arctostaphylos pechoensis +
Flowering winter–early spring.  +
Arctostaphylos pilosula +
Flowering winter–early spring.  +
Arctostaphylos pringlei subsp. drupacea +
Flowering early–late spring.  +
Arctostaphylos pringlei subsp. pringlei +
Flowering early–late spring.  +
Arctostaphylos pumila +
Flowering winter–early spring.  +
Arctostaphylos pungens +
Flowering winter–early summer.  +
Arctostaphylos purissima +
Flowering winter–early spring.  +
Arctostaphylos rainbowensis +
Flowering winter–early spring.  +
Arctostaphylos refugioensis +
Flowering winter–early spring.  +
Arctostaphylos regismontana +
Flowering winter–early spring.  +
Arctostaphylos rudis +
Flowering winter–early spring.  +
Arctostaphylos sensitiva +
Flowering winter–early spring.  +
Arctostaphylos silvicola +
Flowering winter–early spring.  +
Arctostaphylos stanfordiana subsp. decumbens +
Flowering winter–early spring.  +
Arctostaphylos stanfordiana subsp. raichei +
Flowering winter–early spring.  +
Arctostaphylos stanfordiana subsp. stanfordiana +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. bracteosa +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. daciticola +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. hebeclada +
Flowering winter–early spring.  +
Arctostaphylos tomentosa subsp. tomentosa +
Flowering winter–early spring.  +
Arctostaphylos uva-ursi +
Flowering winter–early summer.  +
Arctostaphylos virgata +
Flowering early winter–early spring.  +
Arctostaphylos viridissima +
Flowering winter–early spring.  +
Arctostaphylos viscida subsp. mariposa +
Flowering winter–early spring.  +
Arctostaphylos viscida subsp. pulchella +
Flowering winter–early spring.  +
Arctostaphylos viscida subsp. viscida +
Flowering winter–early spring.  +
Arctotheca calendula +
Flowering Oct–Aug.  +
Arctotis fastuosa +
Flowering spring–summer.  +
Arctotis stoechadifolia +
Flowering (Jan–)Apr–Nov.  +
Arctous alpina +
Flowering early summer.  +
Arctous rubra +
Flowering summer.  +
Ardisia crenata +
Flowering May–Jun  +, fruiting Jul–Dec.  +
Ardisia elliptica +
Flowering Feb–Apr  +, fruiting Sep–Nov.  +
Ardisia escallonioides +
Flowering May–Jun  +, fruiting Nov–May.  +
Ardisia japonica +
Flowering Apr–Jun  +, fruiting Nov–Jan.  +
Arenaria benthamii +
Flowering late spring.  +
Arenaria humifusa +
Flowering spring–summer.  +
Arenaria lanuginosa var. lanuginosa +
Flowering spring–summer.  +
Arenaria lanuginosa var. saxosa +
Flowering spring–summer.  +
Arenaria livermorensis +
Flowering spring–summer.  +
Arenaria longipedunculata +
Flowering spring–summer.  +
Arenaria ludens +
Flowering late summer–early autumn.  +
Arenaria paludicola +
Flowering late spring–summer.  +
Arenaria pseudofrigida +
Flowering spring–summer.  +
Arenaria serpyllifolia var. serpyllifolia +
Flowering spring–summer.  +
Arenaria serpyllifolia var. tenuior +
Flowering spring–summer.  +
Arethusa bulbosa +
Flowering Jun–Jul.  +
Argemone aenea +
Flowering and fruiting early spring–summer.  +
Argemone albiflora subsp. albiflora +
Flowering early spring–summer  +, fruiting late spring–summer.  +
Argemone albiflora subsp. texana +
Flowering early spring–summer  +, fruiting spring–fall.  +
Argemone arizonica +
Flowering spring  +, fruiting summer.  +
Argemone aurantiaca +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone chisosensis +
Flowering and fruiting spring–fall.  +
Argemone corymbosa subsp. arenicola +
Flowering spring  +, fruiting spring–summer.  +
Argemone corymbosa subsp. corymbosa +
Flowering and fruiting spring.  +
Argemone gracilenta +
Flowering spring  +, fruiting spring–summer.  +
Argemone hispida +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone mexicana +
Flowering and fruiting spring–fall, or throughout year in tropics.  +
Argemone munita subsp. argentea +
Flowering spring  +, fruiting spring–summer.  +
Argemone munita subsp. munita +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone munita subsp. robusta +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone munita subsp. rotundata +
Flowering spring–fall  +, fruiting summer–fall.  +
Argemone ochroleuca +
Flowering and fruiting spring–fall.  +
Argemone pleiacantha subsp. ambigua +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone pleiacantha subsp. pinnatisecta +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone pleiacantha subsp. pleiacantha +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone polyanthemos +
Flowering spring–summer  +, fruiting late spring–summer.  +
Argemone sanguinea +
Flowering early spring–summer  +, fruiting spring–summer.  +
Argemone squarrosa subsp. glabrata +
Flowering spring–summer  +, fruiting summer–fall.  +
Argemone squarrosa subsp. squarrosa +
Flowering spring–summer  +, fruiting summer–fall.  +
Argyranthemum foeniculaceum +
Flowering May.  +
Argyreia nervosa +
Flowering Apr–Aug.  +
Argyrochosma dealbata +
Sporulating summer–fall.  +
Argyrochosma fendleri +
Sporulating summer–fall.  +
Argyrochosma incana +
Sporulating summer–fall.  +
Argyrochosma jonesii +
Sporulating spring–fall.  +
Argyrochosma limitanea subsp. limitanea +
Sporulating summer–fall.  +
Argyrochosma limitanea subsp. mexicana +
Sporulating summer–fall.  +
Argyrochosma microphylla +
Sporulating summer–fall.  +
Argythamnia adenophora +
Flowering Jan–Mar and Jul–Oct.  +
Argythamnia aphoroides +
Flowering Jan–Jul.  +
Argythamnia argothamnoides +
Flowering year-round.  +
Argythamnia argyraea +
Flowering Apr–Jul.  +
Argythamnia brandegeei var. intonsa +
Flowering year-round.  +
Argythamnia claryana +
Flowering Feb–Apr and Oct–Nov.  +
Argythamnia cyanophylla +
Flowering Mar–Jun and Aug–Oct.  +
Argythamnia humilis +
Flowering year-round.  +
Argythamnia lanceolata +
Flowering year-round.  +
Argythamnia mercurialina var. mercurialina +
Flowering Mar–Aug.  +
Argythamnia mercurialina var. pilosissima +
Flowering from Mar–Jul.  +
Argythamnia serrata +
Flowering year-round.  +
Argythamnia simulans +
Flowering Mar–Nov.  +
Arida arizonica +
Flowering Mar–Nov.  +
Arida blepharophylla +
Flowering Sep–Oct.  +
Arida carnosa +
Flowering Aug–Sep.  +
Arida mattturneri +
Flowering Apr–Jul.  +
Arida parviflora +
Flowering Jul–Oct.  +
Arida riparia +
Flowering Apr–Sep.  +
Ariocarpus fissuratus var. fissuratus +
Flowering Sep–Nov.  +
Arisaema dracontium +
Flowering late winter (southern part of range)–late spring.  +
Arisaema triphyllum +
Flowering early–late spring.  +
Aristocapsa insignis +
Flowering May–Jun.  +
Aristolochia californica +
Flowering spring.  +
Aristolochia clematitis +
Flowering summer.  +
Aristolochia coryi +
Flowering late spring–summer.  +
Aristolochia erecta +
Flowering late spring–summer.  +
Aristolochia macrophylla +
Flowering late spring–summer.  +
Aristolochia maxima +
Flowering all year.  +
Aristolochia pentandra +
Flowering winter–early spring.  +
Aristolochia reticulata +
Flowering late spring–summer.  +
Aristolochia serpentaria +
Flowering late spring–summer.  +
Aristolochia tomentosa +
Flowering late spring–summer.  +
Aristolochia watsonii +
Flowering spring–summer.  +
Aristolochia wrightii +
Flowering all year.  +
Arivela viscosa +
Flowering summer.  +
Armeria maritima subsp. californica +
Flowering mid spring-mid summer.  +
Armeria maritima subsp. interior +
Flowering summer.  +
Armeria maritima subsp. maritima +
Flowering late spring–early summer.  +
Armeria maritima subsp. sibirica +
Flowering summer.  +
Armoracia rusticana +
Flowering Mar–Jul.  +
Arnica acaulis +
Flowering Apr–Jun.  +
Arnica angustifolia subsp. angustifolia +
Flowering May–Sep.  +
Arnica angustifolia subsp. tomentosa +
Flowering Jul–Aug.  +
Arnica cernua +
Flowering Apr–Jun.  +
Arnica chamissonis +
Flowering Apr–Sep.  +
Arnica cordifolia +
Flowering May–Jul.  +
Arnica dealbata +
Flowering Jun–Aug.  +
Arnica discoidea +
Flowering May–Jul.  +
Arnica fulgens +
Flowering May–Jul.  +
Arnica gracilis +
Flowering Jul–Aug.  +
Arnica griscomii subsp. frigida +
Flowering Jul–Aug.  +
Arnica griscomii subsp. griscomii +
Flowering Jun–Jul.  +
Arnica lanceolata subsp. lanceolata +
Flowering Jun–Sep.  +
Arnica lanceolata subsp. prima +
Flowering May–Sep.  +
Arnica latifolia +
Flowering Jul–Aug.  +
Arnica lessingii +
Flowering Jun–Sep.  +
Arnica lonchophylla +
Flowering June–Aug.  +
Arnica longifolia +
Flowering Jun–Oct.  +
Arnica louiseana +
Flowering Jul–Aug.  +
Arnica mollis +
Flowering Jun–Sep.  +
Arnica nevadensis +
Flowering Jul–Aug.  +
Arnica ovata +
Flowering Jul–Sep.  +
Arnica parryi +
Flowering May–Sep.  +
Arnica rydbergii +
Flowering Jul–Aug.  +
Arnica sororia +
Flowering May–Jul.  +
Arnica spathulata +
Flowering Apr–Jul.  +
Arnica unalaschcensis +
Flowering Jun–Aug.  +
Arnica venosa +
Flowering May–Jun.  +
Arnica viscosa +
Flowering Aug–Sep.  +
Arnoglossum album +
Flowering May–mid July.  +
Arnoglossum atriplicifolium +
Flowering Jul–Nov.  +
Arnoglossum diversifolium +
Flowering mid May–early Jul (Aug–Sep, peninsular Florida).  +
Arnoglossum floridanum +
Flowering May–Jul.  +
Arnoglossum ovatum +
Flowering (May–)Aug–Oct(–Dec).  +
Arnoglossum plantagineum +
Flowering May (south)–Aug (north).  +
Arnoglossum reniforme +
Flowering mid May–early Sep.  +
Arnoglossum sulcatum +
Flowering Sep–Nov.  +
Arnoseris minima +
Flowering Jun–Sep.  +
Aronia arbutifolia +
Flowering Feb–May  +, fruiting Sep–Nov.  +
Aronia melanocarpa +
Flowering Mar–Jun  +, fruiting Sep–Nov.  +
Artemisia abrotanum +
Flowering late summer–fall.  +
Artemisia absinthium +
Flowering mid summer–fall.  +
Artemisia alaskana +
Flowering early–late summer.  +
Artemisia aleutica +
Flowering mid–late summer.  +
Artemisia annua +
Flowering late summer–fall.  +
Artemisia arbuscula subsp. arbuscula +
Flowering mid–late summer.  +
Artemisia arbuscula subsp. longiloba +
Flowering early–late spring.  +
Artemisia arbuscula subsp. thermopola +
Flowering mid–late summer.  +
Artemisia biennis +
Flowering mid summer–late fall.  +
Artemisia bigelovii +
Flowering early summer–late fall.  +
Artemisia borealis subsp. borealis +
Flowering mid–late summer.  +
Artemisia borealis subsp. richardsoniana +
Flowering mid–late summer.  +
Artemisia californica +
Flowering early–late summer.  +
Artemisia campestris subsp. canadensis +
Flowering early–late summer.  +
Artemisia campestris subsp. caudata +
Flowering early–late summer.  +
Artemisia campestris subsp. pacifica +
Flowering mid–late summer.  +
Artemisia cana subsp. bolanderi +
Flowering mid–late summer.  +
Artemisia cana subsp. cana +
Flowering mid–late summer.  +
Artemisia cana subsp. viscidula +
Flowering mid–late summer.  +
Artemisia carruthii +
Flowering mid summer–early fall.  +
Artemisia douglasiana +
Flowering mid spring–late fall.  +
Artemisia dracunculus +
Flowering mid summer–late fall.  +
Artemisia filifolia +
Flowering late summer–early winter.  +
Artemisia franserioides +
Flowering late summer–early fall.  +
Artemisia frigida +
Flowering summer–fall.  +
Artemisia furcata +
Flowering late summer.  +
Artemisia globularia subsp. globularia +
Flowering late summer.  +
Artemisia globularia subsp. lutea +
Flowering late spring–mid summer.  +
Artemisia glomerata +
Flowering mid summer.  +
Artemisia laciniata subsp. laciniata +
Flowering mid–late summer.  +
Artemisia laciniata subsp. parryi +
Flowering late summer–fall.  +
Artemisia longifolia +
Flowering mid summer–early fall.  +
Artemisia ludoviciana subsp. albula +
Flowering early summer–fall.  +
Artemisia ludoviciana subsp. candicans +
Flowering mid–late summer.  +
Artemisia ludoviciana subsp. incompta +
Flowering mid summer–late fall.  +
Artemisia ludoviciana subsp. ludoviciana +
Flowering mid summer–late fall.  +
Artemisia ludoviciana subsp. mexicana +
Flowering late summer–late fall.  +
Artemisia ludoviciana subsp. redolens +
Flowering mid–late summer.  +
Artemisia michauxiana +
Flowering mid summer–early fall.  +
Artemisia nesiotica +
Flowering mid–late summer.  +
Artemisia norvegica subsp. saxatilis +
Flowering mid–late summer.  +
Artemisia nova +
Flowering mid summer–late fall.  +
Artemisia packardiae +
Flowering late summer.  +
Artemisia palmeri +
Flowering early–mid summer.  +
Artemisia papposa +
Flowering early spring–mid summer.  +
Artemisia pattersonii +
Flowering mid–late summer.  +
Artemisia pedatifida +
Flowering early spring–mid summer.  +
Artemisia pontica +
Flowering late summer–fall.  +
Artemisia porteri +
Flowering mid–late summer.  +
Artemisia pycnocephala +
Flowering late spring–mid summer.  +
Artemisia pygmaea +
Flowering mid summer–fall.  +
Artemisia rigida +
Flowering mid summer–early fall.  +
Artemisia rothrockii +
Flowering mid summer–all.  +
Artemisia rupestris +
Flowering late summer–fall.  +
Artemisia scopulorum +
Flowering mid–late summer.  +
Artemisia senjavinensis +
Flowering mid–late summer.  +
Artemisia serrata +
Flowering mid summer–early fall.  +
Artemisia spiciformis +
Flowering mid summer–fall.  +
Artemisia stelleriana +
Flowering early spring–fall.  +
Artemisia suksdorfii +
Flowering mid summer–fall.  +
Artemisia tilesii +
Flowering mid summer–early fall.  +
Artemisia tridentata subsp. parishii +
Flowering mid summer–late fall.  +
Artemisia tridentata subsp. tridentata +
Flowering mid summer–late fall.  +
Artemisia tridentata subsp. vaseyana +
Flowering mid summer–late fall.  +
Artemisia tridentata subsp. wyomingensis +
Flowering mid summer–late fall.  +
Artemisia tripartita subsp. rupicola +
Flowering early–late summer.  +
Artemisia tripartita subsp. tripartita +
Flowering mid summer–late fall.  +
Artemisia vulgaris +
Flowering mid summer–late fall.  +
Arthrocnemum subterminale +
Flowering late spring–late summer.  +
Aruncus dioicus var. acuminatus +
Flowering early summer.  +
Aruncus dioicus var. dioicus +
Flowering early summer.  +
Aruncus dioicus var. pubescens +
Flowering early summer.  +
Aruncus dioicus var. vulgaris +
Flowering summer.  +
Asanthus squamulosus +
Flowering Apr–May.  +
Asarum canadense +
Flowering spring–early summer (Mar–Jul).  +
Asarum caudatum +
Flowering spring–summer (Apr–Jul).  +
Asarum hartwegii +
Flowering spring–summer (Apr–Jul).  +
Asarum lemmonii +
Flowering spring–summer (May–Jul).  +
Asarum marmoratum +
Flowering late winter–spring (Mar–Jun).  +
Asarum wagneri +
Flowering spring–summer (May–Jul).  +
Aschisma kansanum +
Capsules mature Apr.  +
Asclepias albicans +
Flowering and fruiting year-round.  +
Asclepias amplexicaulis +
Flowering Mar–Sep  +, fruiting (Apr–)May–Sep.  +
Asclepias angustifolia +
Flowering Apr–Oct  +, fruiting Jul–Oct.  +
Asclepias arenaria +
Flowering May–Aug(–Oct)  +, fruiting Jul–Sep(–Oct).  +
Asclepias asperula subsp. asperula +
Flowering Mar–Sep(–Oct)  +, fruiting (Apr–)May–Sep(–Oct).  +
Asclepias asperula subsp. capricornu +
Flowering Mar–Sep(–Nov)  +, fruiting Apr–Sep(–Nov).  +
Asclepias brachystephana +
Flowering Apr–Sep(–Oct)  +, fruiting (May–)Jun–Oct.  +
Asclepias californica subsp. californica +
Flowering (Feb–)Mar–Jul(–Aug)  +, fruiting (Apr–)May–Aug(–Sep).  +
Asclepias californica subsp. greenei +
Flowering Mar–Jul  +, fruiting May–Aug(–Sep).  +
Asclepias cinerea +
Flowering May–Sep(–Nov)  +, fruiting Jun–Sep.  +
Asclepias connivens +
Flowering May–Aug(–Sep)  +, fruiting Jul–Sep(–Nov).  +
Asclepias cordifolia +
Flowering Mar–Jul(–Aug)  +, fruiting Jun–Sep.  +
Asclepias cryptoceras subsp. cryptoceras +
Flowering Apr–Jul  +, fruiting May–Jul.  +
Asclepias cryptoceras subsp. davisii +
Flowering Apr–Jul  +, fruiting May–Jul.  +
Asclepias curassavica +
Flowering and fruiting year-round.  +
Asclepias curtissii +
Flowering Apr–Oct  +, fruiting Jul–Oct.  +
Asclepias cutleri +
Flowering Apr–Jun  +, fruiting May–Jun.  +
Asclepias eastwoodiana +
Flowering May–Jun  +, fruiting Jun.  +
Asclepias elata +
Flowering Jun–Sep  +, fruiting Aug–Oct.  +
Asclepias emoryi +
Flowering Mar–Aug(–Oct)  +, fruiting Jul–Nov.  +
Asclepias engelmanniana +
Flowering (May–)Jun–Sep  +, fruiting Jul–Oct(–Nov).  +
Asclepias eriocarpa +
Flowering (Apr–)May–Oct  +, fruiting (May–)Jun–Oct.  +
Asclepias erosa +
Flowering Mar–Nov  +, fruiting Apr–Nov.  +
Asclepias exaltata +
Flowering May–Aug  +, fruiting May–Oct.  +
Asclepias fascicularis +
Flowering Apr–Oct  +, fruiting (Jun–)Jul–Nov.  +
Asclepias feayi +
Flowering (Feb–)Apr–Sep(–Nov)  +, fruiting Jun–Aug.  +
Asclepias hallii +
Flowering Jun–Aug  +, fruiting Jul–Sep.  +
Asclepias hirtella +
Flowering Apr–Oct  +, fruiting Jun–Oct.  +
Asclepias humistrata +
Flowering (Feb–)Mar–Oct  +, fruiting (Mar–)Apr–Oct(–Nov).  +
Asclepias hypoleuca +
Flowering Jun–Sep  +, fruiting Aug–Sep.  +
Asclepias incarnata subsp. incarnata +
Flowering (Apr–)Jun–Sep  +, fruiting Jul–Nov.  +
Asclepias incarnata subsp. pulchra +
Flowering Jun–Sep  +, fruiting Jul–Oct.  +
Asclepias involucrata +
Flowering Mar–Jul  +, fruiting May–Aug.  +
Asclepias labriformis +
Flowering May–Aug  +, fruiting Jun–Oct.  +
Asclepias lanceolata +
Flowering year-round  +, fruiting Jun–Nov.  +
Asclepias lanuginosa +
Flowering May–Aug  +, fruiting Jul–Aug.  +
Asclepias latifolia +
Flowering May–Sep  +, fruiting Jun–Oct.  +
Asclepias lemmonii +
Flowering Jun–Sep  +, fruiting Aug–Oct.  +
Asclepias linaria +
Flowering and fruiting year-round.  +
Asclepias linearis +
Flowering (Mar–)Apr–Oct  +, fruiting Jul–Oct.  +
Asclepias longifolia +
Flowering (Jan–)Feb–Sep(–Oct)  +, fruiting Apr–Aug.  +
Asclepias macrosperma +
Flowering Apr–Jun  +, fruiting May–Jul.  +
Asclepias macrotis +
Flowering May–Oct  +, fruiting Jun–Oct.  +
Asclepias meadii +
Flowering May–Jun(–Jul)  +, fruiting Jun–Aug.  +
Asclepias michauxii +
Flowering (Mar–)Apr–Jun(–Sep)  +, fruiting May–Aug.  +
Asclepias nummularia +
Flowering Mar–May  +, fruiting May–Aug.  +
Asclepias nyctaginifolia +
Flowering Apr–Sep(–Nov)  +, fruiting May–Nov.  +
Asclepias obovata +
Flowering May–Sep  +, fruiting Jul–Oct.  +
Asclepias oenotheroides +
Flowering (Feb–)Mar–Nov  +, fruiting (Apr–)May–Nov.  +
Asclepias ovalifolia +
Flowering May–Aug  +, fruiting Jul–Sep.  +
Asclepias pedicellata +
Flowering Mar–Nov(–Dec)  +, fruiting May–Oct.  +
Asclepias perennis +
Flowering (Mar–)Apr–Nov  +, fruiting Jun–Dec.  +
Asclepias prostrata +
Flowering Mar–Oct  +, fruiting Jul–Oct(–Dec).  +
Asclepias pumila +
Flowering (May–)Jun–Sep  +, fruiting Aug–Oct.  +
Asclepias purpurascens +
Flowering May–Jul(–Sep)  +, fruiting Jul–Oct.  +
Asclepias quadrifolia +
Flowering (Mar–)Apr–Aug(–Sep)  +, fruiting May–Nov.  +
Asclepias quinquedentata +
Flowering Jun–Aug  +, fruiting Jul–Nov.  +
Asclepias rubra +
Flowering Apr–Sep  +, fruiting Jul–Oct.  +
Asclepias rusbyi +
Flowering Jun–Aug  +, fruiting Aug–Oct.  +
Asclepias ruthiae +
Flowering May–Jun  +, fruiting Jun–Jul.  +
Asclepias sanjuanensis +
Flowering Apr–May  +, fruiting May–Jun.  +
Asclepias scaposa +
Flowering Mar–Aug  +, fruiting May.  +
Asclepias solanoana +
Flowering (Apr–)May–Aug  +, fruiting Jun–Jul.  +
Asclepias speciosa +
Flowering (Apr–)May–Sep  +, fruiting Jul–Oct.  +
Asclepias sperryi +
Flowering Apr–Sep  +, fruiting Aug–Sep.  +
Asclepias stenophylla +
Flowering May–Aug  +, fruiting (Jun–)Aug–Oct.  +
Asclepias subulata +
Flowering and fruiting year-round.  +
Asclepias subverticillata +
Flowering (Apr–)May–Oct  +, fruiting (Jun–)Jul–Dec.  +
Asclepias sullivantii +
Flowering (May–)Jun–Aug(–Sep)  +, fruiting Jun–Oct.  +
Asclepias syriaca +
Flowering May–Sep(–Oct)  +, fruiting Jun–Oct.  +
Asclepias texana +
Flowering May–Sep  +, fruiting (Jul–)Aug–Oct.  +
Asclepias tomentosa +
Flowering May–Aug(–Oct)  +, fruiting Jun–Oct.  +
Asclepias tuberosa subsp. interior +
Flowering (Apr–)May–Sep(–Oct)  +, fruiting Jun–Oct.  +
Asclepias tuberosa subsp. rolfsii +
Flowering year-round  +, fruiting Jun–Sep.  +
Asclepias tuberosa subsp. tuberosa +
Flowering Apr–Sep(–Oct)  +, fruiting Jul–Oct.  +
Asclepias uncialis +
Flowering Mar–Jun  +, fruiting Apr–Jun.  +
Asclepias variegata +
Flowering Mar–Aug  +, fruiting Jun–Nov.  +
Asclepias verticillata +
Flowering Feb–Oct  +, fruiting Mar–Nov(–Dec).  +
Asclepias vestita +
Flowering Apr–Jul  +, fruiting May–Sep.  +
Asclepias viridiflora +
Flowering Apr–Sep(–Oct)  +, fruiting Jun–Nov.  +
Asclepias viridis +
Flowering Jan–Nov  +, fruiting (Apr–)May–Nov.  +
Asclepias viridula +
Flowering Apr–Sep  +, fruiting Jun–Oct.  +
Asclepias welshii +
Flowering May–Sep  +, fruiting Jun–Oct.  +
Asemeia grandiflora +
Flowering spring–summer (year-round).  +
Asimina incana +
Flowering spring–early summer.  +
Asimina longifolia var. longifolia +
Flowering spring–early summer, all year if disturbed.  +
Asimina longifolia var. spatulata +
Flowering spring–early summer(-fall).  +
Asimina obovata +
Flowering late winter–early summer.  +
Asimina parviflora +
Flowering early spring.  +
Asimina pygmaea +
Flowering spring–early summer.  +
Asimina reticulata +
Flowering winter–spring.  +
Asimina tetramera +
Flowering spring–summer, all year if disturbed.  +
Asimina triloba +
Flowering early spring.  +
Asparagus aethiopicus +
Flowering spring–summer.  +
Asparagus asparagoides +
Flowering spring–summer.  +
Asparagus officinalis +
Flowering summer.  +
Asparagus setaceus +
Flowering spring–summer.  +
Asphodelus fistulosus +
Flowering late winter–spring.  +
Aspicarpa hirtella +
Flowering and fruiting (May–)Jul–Sep(–Oct).  +
Aspicarpa hyssopifolia +
Flowering and fruiting Apr–Nov.  +
Aster alpinus subsp. vierhapperi +
Flowering early summer.  +
Aster tataricus +
Flowering fall.  +
Astilbe biternata +
Flowering Jun.  +
Astraea lobata +
Flowering Jun–Nov.  +
Astranthium ciliatum +
Flowering Mar–May.  +
Astranthium integrifolium +
Flowering Apr–Jun(–Jul).  +
Astranthium robustum +
Flowering Mar–Jun.  +
Astrolepis cochisensis subsp. arizonica +
Sporulating summer–fall.  +
Astrolepis cochisensis subsp. chihuahuensis +
Sporulating summer–fall.  +
Astrolepis cochisensis subsp. cochisensis +
Sporulating summer–fall.  +
Astrolepis integerrima +
Sporulating summer–fall.  +
Astrolepis sinuata subsp. mexicana +
Sporulating summer–fall.  +
Astrolepis sinuata subsp. sinuata +
Sporulating summer–fall.  +
Astrolepis windhamii +
Sporulating summer–fall.  +
Astrophytum asterias +
Flowering Mar–May and sporadically after summer rainfall.  +
Atamisquea emarginata +
Flowering early summer.  +
Athysanus pusillus +
Flowering Feb–Jun.  +
Athysanus unilateralis +
Flowering Feb–May.  +
Atrichoseris platyphylla +
Flowering Feb–May.  +
Atrichum altecristatum +
Capsules mature spring–fall (Mar–Oct).  +
Atrichum angustatum +
Capsules mature spring–summer (Apr–Jul).  +
Atrichum crispulum +
Capsules mature summer (Jun–Aug).  +
Atrichum crispum +
Capsules mature spring–summer (Apr–June).  +
Atrichum flavisetum +
Capsule maturity date not determined.  +
Atrichum selwynii +
Capsules mature spring–late summer (Mar–Sept).  +
Atrichum tenellum +
Capsules mature late summer (Aug–Sep).  +
Atrichum undulatum +
Capsules mature spring–summer (Apr- Jul).  +
Atriplex amnicola +
Flowering summer–fall.  +
Atriplex argentea var. argentea +
Flowering summer–fall.  +
Atriplex argentea var. hillmanii +
Flowering summer–fall.  +
Atriplex argentea var. longitrichoma +
Flowering summer–fall.  +
Atriplex argentea var. mohavensis +
Flowering summer–fall.  +
Atriplex argentea var. rydbergii +
Flowering summer–fall.  +
Atriplex californica +
Flowering Apr–Nov.  +
Atriplex canescens var. canescens +
Flowering spring–fall.  +
Atriplex canescens var. gigantea +
Flowering summer–fall.  +
Atriplex canescens var. laciniata +
Flowering spring–fall.  +
Atriplex canescens var. macilenta +
Flowering spring–fall.  +
Atriplex confertifolia +
Flowering spring–fall.  +
Atriplex cordulata var. cordulata +
Flowering spring–fall.  +
Atriplex cordulata var. erecticaulis +
Flowering summer–early fall.  +
Atriplex coronata var. coronata +
Flowering spring–fall.  +
Atriplex coronata var. notatior +
Flowering spring–fall.  +
Atriplex coronata var. vallicola +
Flowering spring–fall.  +
Atriplex corrugata +
Flowering spring–fall.  +
Atriplex coulteri +
Flowering spring–fall.  +
Atriplex covillei +
Flowering summer–fall.  +
Atriplex dioica +
Flowering summer–fall.  +
Atriplex elegans var. elegans +
Flowering spring–fall.  +
Atriplex elegans var. fasciculata +
Flowering spring–fall.  +
Atriplex fruticulosa +
Flowering summer–fall.  +
Atriplex gardneri var. aptera +
Flowering summer–fall.  +
Atriplex gardneri var. bonnevillensis +
Flowering summer–fall.  +
Atriplex gardneri var. cuneata +
Flowering spring–fall.  +
Atriplex gardneri var. falcata +
Flowering summer–fall.  +
Atriplex gardneri var. gardneri +
Flowering spring–fall.  +
Atriplex gardneri var. utahensis +
Flowering summer–fall.  +
Atriplex gardneri var. welshii +
Flowering spring–fall.  +
Atriplex garrettii var. garrettii +
Flowering spring–fall.  +
Atriplex garrettii var. navajoensis +
Flowering summer–fall.  +
Atriplex glabriuscula var. acadiensis +
Flowering late summer–fall.  +
Atriplex glabriuscula var. franktonii +
Flowering late summer–fall.  +
Atriplex glabriuscula var. glabriuscula +
Flowering late summer.  +
Atriplex gmelinii var. alaskensis +
Flowering summer.  +
Atriplex gmelinii var. gmelinii +
Flowering summer.  +
Atriplex graciliflora +
Flowering summer.  +
Atriplex heterosperma +
Flowering summer–fall.  +
Atriplex holocarpa +
Flowering summer.  +
Atriplex hortensis +
Flowering summer–fall.  +
Atriplex hymenelytra +
Flowering spring.  +
Atriplex joaquiniana +
Flowering summer.  +
Atriplex klebergorum +
Flowering summer.  +
Atriplex laciniata +
Flowering summer–fall.  +
Atriplex lentiformis +
Flowering spring–fall.  +
Atriplex leucophylla +
Flowering spring–fall.  +
Atriplex linearis +
Flowering spring–fall.  +
Atriplex littoralis +
Flowering summer.  +
Atriplex matamorensis +
Flowering summer and fall.  +
Atriplex mucronata +
Flowering summer–fall.  +
Atriplex nudicaulis +
Flowering late summer–fall.  +
Atriplex nummularia +
Flowering summer–fall.  +
Atriplex oblongifolia +
Flowering summer.  +
Atriplex obovata +
Flowering summer–fall.  +
Atriplex pacifica +
Flowering early spring–fall.  +
Atriplex parishii var. depressa +
Flowering late summer–fall.  +
Atriplex parishii var. minuscula +
Flowering late summer–fall.  +
Atriplex parishii var. parishii +
Flowering late summer–fall.  +
Atriplex parishii var. persistens +
Flowering spring–fall.  +
Atriplex parishii var. subtilis +
Flowering late spring–fall.  +
Atriplex parryi +
Flowering spring–fall.  +
Atriplex patula +
Flowering summer–fall.  +
Atriplex pentandra +
Flowering summer–fall.  +
Atriplex phyllostegia +
Flowering Apr–Aug.  +
Atriplex pleiantha +
Flowering late summer–fall.  +
Atriplex polycarpa +
Flowering spring–fall.  +
Atriplex powellii var. minuticarpa +
Flowering spring–fall.  +
Atriplex powellii var. powellii +
Flowering summer–fall.  +
Atriplex prostrata +
Flowering in summer–fall.  +
Atriplex pusilla +
Flowering Jun–Oct.  +
Atriplex rosea +
Flowering mid summer–fall.  +
Atriplex saccaria var. asterocarpa +
Flowering Apr–Sep.  +
Atriplex saccaria var. cornuta +
Flowering late summer–fall.  +
Atriplex semibaccata +
Flowering spring–early winter.  +
Atriplex serenana var. davidsonii +
Flowering spring–fall.  +
Atriplex serenana var. serenana +
Flowering spring–fall.  +
Atriplex spinifera +
Flowering summer–fall.  +
Atriplex suberecta +
Flowering summer–fall.  +
Atriplex suckleyi +
Flowering late summer–fall.  +
Atriplex tatarica +
Flowering late summer–fall.  +
Atriplex torreyi var. griffithsii +
Flowering spring–winter.  +
Atriplex torreyi var. torreyi +
Flowering spring–fall.  +
Atriplex truncata +
Flowering summer–fall.  +
Atriplex tularensis +
Flowering summer–fall.  +
Atriplex watsonii +
Flowering spring–fall.  +
Atriplex wolfii var. tenuissima +
Flowering summer–fall.  +
Atriplex wolfii var. wolfii +
Flowering summer–fall.  +
Atriplex wrightii +
Flowering summer–fall.  +
Atropa belladonna +
Flowering Jun–Aug.  +
Aubrieta deltoidea +
Flowering Apr–Jun.  +
Aucuba japonica +
Flowering Mar–Apr.  +
Aureolaria flava +
Flowering Jul–Oct.  +
Aureolaria grandiflora +
Flowering Jul–Oct.  +
Aureolaria levigata +
Flowering Jul–Oct.  +
Aureolaria patula +
Flowering Aug–Oct.  +
Aureolaria pectinata +
Flowering Jun–Sep.  +
Aureolaria pedicularia +
Flowering Jun–Sep.  +
Aureolaria virginica +
Flowering Jun–Sep.  +
Aurinia petraea +
Flowering May–Jul.  +
Aurinia saxatilis +
Flowering May–Jul.  +
Axyris amaranthoides +
Flowering summer–fall.  +
Ayenia compacta +
Flowering and fruiting spring–early fall.  +
Ayenia euphrasiifolia +
Flowering and fruiting year-round.  +
Ayenia filiformis +
Flowering and fruiting spring–early fall.  +
Ayenia jaliscana +
Flowering and fruiting late summer–early winter.  +
Ayenia limitaris +
Flowering summer  +, fruiting summer–fall.  +
Ayenia microphylla +
Flowering and fruiting spring–early fall.  +
Ayenia pilosa +
Flowering and fruiting year-round.  +
B
Baccharis angustifolia +
Flowering Sep–Nov.  +
Baccharis bigelovii +
Flowering Aug–Nov.  +
Baccharis brachyphylla +
Flowering Jul–Aug.  +
Baccharis dioica +
Flowering Aug–Nov.  +
Baccharis douglasii +
Flowering Jul–Oct (all year).  +
Baccharis glomeruliflora +
Flowering Oct–Nov.  +
Baccharis glutinosa +
Flowering Jul–Oct (all year).  +
Baccharis halimifolia +
Flowering Aug–Nov.  +
Baccharis havardii +
Flowering Jul–Sep.  +
Baccharis malibuensis +
Flowering Aug–Sep.  +
Baccharis neglecta +
Flowering Aug–Nov.  +
Baccharis pilularis subsp. consanguinea +
Flowering Jul–Dec.  +
Baccharis pilularis subsp. pilularis +
Flowering Jul–Dec.  +
Baccharis plummerae subsp. glabrata +
Flowering Jun–Nov.  +
Baccharis plummerae subsp. plummerae +
Flowering (May–)Aug–Nov.  +
Baccharis pteronioides +
Flowering Apr–Jun.  +
Baccharis salicifolia +
Flowering (Jan–)Mar–Oct.  +
Baccharis salicina +
Flowering May–Nov.  +
Baccharis sarothroides +
Flowering Aug–Nov.  +
Baccharis sergiloides +
Flowering Jul–Oct.  +
Baccharis texana +
Flowering Aug–Nov.  +
Baccharis thesioides +
Flowering Aug–Nov.  +
Baccharis vanessae +
Flowering Oct.  +
Baccharis wrightii +
Flowering Apr–Jul.  +
Bacopa caroliniana +
Flowering Jun–Nov.  +
Bacopa egensis +
Flowering Aug–Oct.  +
Bacopa eisenii +
Flowering May–Oct.  +
Bacopa innominata +
Flowering Jun–Sep.  +
Bacopa monnieri +
Flowering Apr–Sep.  +
Bacopa repens +
Flowering Jul–Sep.  +
Bacopa rotundifolia +
Flowering May–Nov.  +
Bahia absinthifolia +
Flowering Mar–Nov.  +
Bahia bigelovii +
Flowering Jun–Oct.  +
Bahia biternata +
Flowering (May–)Sep–Oct.  +
Bahia pedata +
Flowering (May–)Jul–Aug(–Nov).  +
Bahiopsis laciniata +
Flowering Jan–Jun(–Sep).  +
Bahiopsis parishii +
Flowering (Jan–Oct).  +
Bahiopsis reticulata +
Flowering Mar–Jun.  +
Baileya multiradiata +
Flowering Mar–Nov (depending on rains).  +
Baileya pauciradiata +
Flowering Mar–May.  +
Baileya pleniradiata +
Flowering Mar–Nov (depending on rains).  +
Balduina angustifolia +
Flowering summer–fall (year round south).  +
Balduina atropurpurea +
Flowering summer–fall.  +
Balduina uniflora +
Flowering summer–fall.  +
Balsamorhiza careyana +
Flowering (Mar–)May–Jun(–Jul).  +
Balsamorhiza deltoidea +
Flowering (Mar–)Apr–Jun(–Jul).  +
Balsamorhiza hispidula +
Flowering Apr–May.  +
Balsamorhiza hookeri +
Flowering Apr–May(–Jul).  +
Balsamorhiza incana +
Flowering May–Jun(–Jul).  +
Balsamorhiza lanata +
Flowering Apr–May(–Jun).  +
Balsamorhiza macrolepis +
Flowering Apr–Jun.  +
Balsamorhiza macrophylla +
Flowering May–Jul.  +
Balsamorhiza rosea +
Flowering Apr–May.  +
Balsamorhiza sagittata +
Flowering (Apr–)May–Jun(–Jul).  +
Balsamorhiza sericea +
Flowering Apr–May.  +
Balsamorhiza serrata +
Flowering Apr–Jun.  +
Barbarea orthoceras +
Flowering Mar–Jul.  +
Barbarea stricta +
Flowering Apr–Jul.  +
Barbarea verna +
Flowering Mar–Jul.  +
Barbarea vulgaris +
Flowering Apr–Jul.  +
Barbella pendula +
Capsules mature Mar.  +
Barbula convoluta var. convoluta +
Capsules mature spring–summer (Mar–Aug, Jun).  +
Barbula convoluta var. eustegia +
Capsules mature late spring, summer–fall (May, Jun, Jul, Oct).  +
Barbula unguiculata +
Capsules mature in winter and early spring, occasionally summer or fall.  +
Barkleyanthus salicifolius +
Flowering year-round, mostly spring.  +
Bartlettia scaposa +
Flowering summer–fall, following rains.  +
Bartonia paniculata subsp. iodandra +
Flowering summer–fall.  +
Bartonia paniculata subsp. paniculata +
Flowering summer–fall.  +
Bartonia paniculata subsp. texana +
Flowering fall.  +
Bartonia verna +
Flowering winter (southernmost part of range)–spring (northward).  +
Bartonia virginica +
Flowering late summer–fall.  +
Bartramia brevifolia +
Capsules mature Nov.  +
Bartramia halleriana +
Spores 15-24 µm, mature Jun–Sep.  +
Bartramia ithyphylla +
Capsules mature Jul–Nov.  +
Bartramia pomiformis +
Capsules mature Feb–Nov.  +
Bartramia stricta +
Capsules mature Jan–Aug.  +
Bartramia subulata +
Capsules mature Aug–Nov.  +
Bartsia alpina +
Flowering Jun–Aug.  +
Basiphyllaea corallicola +
Flowering Sep–Nov.  +
Bassia hirsuta +
Flowering late summer–fall.  +
Bassia hyssopifolia +
Flowering late summer–fall.  +
Bastardia viscosa +
Flowering year-round.  +
Batesimalva violacea +
Flowering fall.  +
Batis maritima +
Flowering (Jan-)Apr–Sep [year-round in the tropics].  +
Bebbia juncea var. aspera +
Flowering mostly year round.  +
Begonia cucullata +
Flowering spring.  +
Begonia hirtella +
Flowering spring.  +
Bejaria racemosa +
Flowering spring.  +
Belamcanda chinensis +
Flowering Jun–Aug.  +
Bellardia latifolia +
Flowering Apr–May.  +
Bellardia trixago +
Flowering Mar–Jun.  +
Bellardia viscosa +
Flowering Apr–Sep.  +
Bellis perennis +
Flowering spring–summer.  +
Beloglottis costaricensis +
Flowering Mar–Apr.  +
Benitoa occidentalis +
Flowering Jun–Nov.  +
Bensoniella oregona +
Flowering May–Aug.  +
Berberis amplectens +
Flowering spring (Apr–May).  +
Berberis aquifolium +
Flowering winter–spring (Mar–Jun).  +
Berberis bealei +
Flowering fall–winter (Dec–Mar).  +
Berberis canadensis +
Flowering spring (Apr–May).  +
Berberis darwinii +
Flowering winter (Feb).  +
Berberis dictyota +
Flowering winter–spring (Mar–Apr).  +
Berberis fendleri +
Flowering spring–summer (May–Aug).  +
Berberis fremontii +
Flowering spring (Apr–Jun).  +
Berberis haematocarpa +
Flowering winter–spring (Feb–Jun).  +
Berberis harrisoniana +
Flowering winter (Jan–Mar).  +
Berberis higginsiae +
Flowering spring (Apr–Jun).  +
Berberis nervosa +
Flowering winter–spring (Mar–Jun).  +
Berberis nevinii +
Flowering winter–spring (Feb–May).  +
Berberis pinnata subsp. insularis +
Flowering winter (Mar).  +
Berberis pinnata subsp. pinnata +
Flowering winter–spring (Feb–May).  +
Berberis piperiana +
Flowering winter–spring (Mar–Jun).  +
Berberis pumila +
Flowering winter–spring (Mar–May).  +
Berberis repens +
Flowering spring (Apr–Jun).  +
Berberis swaseyi +
Flowering winter–spring (Feb–Apr).  +
Berberis thunbergii +
Flowering late winter–spring (Mar–May).  +
Berberis trifoliolata +
Flowering winter–spring (Feb–Apr).  +
Berberis vulgaris +
Flowering spring (May–Jun).  +
Berberis wilcoxii +
Flowering spring (Apr–May).  +
Berchemia scandens +
Flowering Mar–May.  +
Bergerocactus emoryi +
Flowering Apr–Jul.  +
Bergia texana +
Flowering summer(–early fall).  +
Berlandiera lyrata +
Flowering nearly year round.  +
Berlandiera monocephala +
Flowering May–Oct.  +
Berlandiera pumila +
Flowering Apr–Aug.  +
Berlandiera subacaulis +
Flowering year round.  +
Berlandiera texana +
Flowering Mar–Nov.  +
Berlandiera ×betonicifolia +
Flowering Apr–Sep.  +
Berlandiera ×humilis +
Flowering Mar–Jun(–Dec).  +
Berlandiera ×macrophylla +
Flowering late spring–fall.  +
Bernardia incana +
Flowering spring–summer  +, fruiting summer–fall.  +
Bernardia myricifolia +
Flowering spring–summer  +, fruiting summer–fall.  +
Bernardia obovata +
Flowering spring  +, fruiting summer–fall.  +
Berteroa incana +
Flowering May–Sep.  +
Beta vulgaris subsp. maritima +
Flowering spring–early fall.  +
Beta vulgaris subsp. vulgaris +
Flowering spring–summer.  +
Betula alleghaniensis +
Flowering late spring.  +
Betula cordifolia +
Flowering late spring.  +
Betula glandulosa +
Flowering late spring.  +
Betula kenaica +
Flowering late spring.  +
Betula lenta +
Flowering late spring.  +
Betula michauxii +
Flowering late spring.  +
Betula minor +
Flowering late spring.  +
Betula murrayana +
Flowering late spring.  +
Betula nana subsp. exilis +
Flowering late spring.  +
Betula nana subsp. nana +
Flowering late spring.  +
Betula neoalaskana +
Flowering late spring.  +
Betula nigra +
Flowering late spring.  +
Betula occidentalis +
Flowering late spring.  +
Betula papyrifera +
Flowering late spring.  +
Betula pendula +
Flowering late spring.  +
Betula populifolia +
Flowering late spring.  +
Betula pubescens subsp. pubescens +
Flowering late spring.  +
Betula pubescens subsp. tortuosa +
Flowering late spring.  +
Betula pumila +
Flowering late spring.  +
Betula uber +
Flowering late spring.  +
Bidens amplissima +
Flowering Aug–Oct.  +
Bidens aristosa +
Flowering Aug–Oct(–Nov).  +
Bidens aurea +
Flowering mostly Aug–Sep.  +
Bidens beckii +
Flowering Jul–Sep.  +
Bidens bidentoides +
Flowering Sep.  +
Bidens bigelovii +
Flowering Sep.  +
Bidens bipinnata +
Flowering (Jun–)Aug–Sep(–Oct).  +
Bidens cernua +
Flowering late (Jul–)Aug–Sep(–Oct).  +
Bidens connata +
Flowering Aug–Oct.  +
Bidens discoidea +
Flowering Aug–Oct(–Nov).  +
Bidens eatonii +
Flowering Sep–Oct.  +
Bidens frondosa +
Flowering (Jun–)Aug–Sep(–Oct).  +
Bidens heterodoxa +
Flowering Aug–Oct.  +
Bidens heterosperma +
Flowering Sep–Oct.  +
Bidens hyperborea +
Flowering Aug–Oct.  +
Bidens laevis +
Flowering Aug–Oct(–Dec).  +
Bidens lemmonii +
Flowering Sep–Oct.  +
Bidens leptocephala +
Flowering Sep.  +
Bidens mitis +
Flowering Sep–Nov.  +
Bidens pilosa +
Flowering year round.  +
Bidens polylepis +
Flowering Aug–Oct.  +
Bidens tenuisecta +
Flowering (Jul–)Aug–Sep(–Oct).  +
Bidens trichosperma +
Flowering Aug–Oct.  +
Bidens tripartita +
Flowering Aug–Oct.  +
Bidens vulgata +
Flowering Aug–Sep(–Oct).  +
Bigelowia nudata var. australis +
Flowering Oct–May.  +
Bigelowia nudata var. nudata +
Flowering Aug–Oct(–Nov).  +
Bigelowia nuttallii +
Flowering Sep–Oct(–Nov).  +
Billieturnera helleri +
Flowering year-round.  +
Bischofia javanica +
Flowering Feb–Apr  +, fruiting Jul–Nov.  +
Bistorta bistortoides +
Flowering Jul–Sep.  +
Bistorta officinalis +
Flowering May–Aug.  +
Bistorta plumosa +
Flowering May–Jun.  +
Bistorta vivipara +
Flowering Jun–Sep.  +
Blennosperma bakeri +
Flowering Feb–Apr.  +
Blennosperma nanum var. nanum +
Flowering Feb–May.  +
Blennosperma nanum var. robustum +
Flowering Feb–May.  +
Blepharipappus scaber +
Flowering Apr–Sep.  +
Blepharizonia laxa +
Flowering Jul–Nov.  +
Blepharizonia plumosa +
Flowering Jul–Nov.  +
Bletia patula +
Flowering Mar–May.  +
Bletia purpurea +
Flowering Dec–May, sporadically all year.  +
Bloomeria clevelandii +
Flowering spring (Apr–Jun).  +
Bloomeria crocea var. aurea +
Flowering spring (Apr–Jun).  +
Bloomeria crocea var. crocea +
Flowering spring (Apr–Jun).  +
Bloomeria crocea var. montana +
Flowering spring (Apr–Jun).  +
Bloomeria humilis +
Flowering spring.  +
Blutaparon vermiculare +
Flowering year-round.  +
Blysmopsis rufa +
Fruiting late summer.  +
Blyxa aubertii +
Flowering summer–fall.  +
Boechera acutina +
Flowering Jun–Jul.  +
Boechera arcuata +
Flowering Mar–Jun.  +
Boechera atrorubens +
Flowering Apr–May.  +
Boechera bodiensis +
Flowering Jul–Aug.  +
Boechera breweri subsp. breweri +
Flowering Mar–Jul.  +
Boechera breweri subsp. shastaensis +
Flowering Mar–Jun.  +
Boechera burkii +
Flowering Apr–May.  +
Boechera calderi +
Flowering Jun–Aug.  +
Boechera californica +
Flowering Mar–Jun.  +
Boechera canadensis +
Flowering Apr–Jul.  +
Boechera cascadensis +
Flowering Jun.  +
Boechera cobrensis +
Flowering May–Jun.  +
Boechera collinsii +
Flowering May–Jun.  +
Boechera consanguinea +
Flowering May.  +
Boechera constancei +
Flowering May.  +
Boechera covillei +
Flowering Jul–Aug.  +
Boechera crandallii +
Flowering May–Jun.  +
Boechera cusickii +
Flowering Apr-mid May.  +
Boechera davidsonii +
Flowering Apr–Jul.  +
Boechera dentata +
Flowering Apr–Jun.  +
Boechera depauperata +
Flowering Jun–Jul.  +
Boechera dispar +
Flowering Apr–May.  +
Boechera divaricarpa +
Flowering May–Jul.  +
Boechera drepanoloba +
Flowering Jul–Aug.  +
Boechera duchesnensis +
Flowering May.  +
Boechera elkoensis +
Flowering Jul.  +
Boechera evadens +
Flowering Jun.  +
Boechera falcatoria +
Flowering May–Jun.  +
Boechera falcifructa +
Flowering May–Jun.  +
Boechera fecunda +
Flowering Apr–Jun.  +
Boechera fendleri +
Flowering Apr–Jul.  +
Boechera fernaldiana subsp. fernaldiana +
Flowering May–Jul.  +
Boechera fernaldiana subsp. vivariensis +
Flowering Apr–Jun.  +
Boechera formosa +
Flowering Apr–Jun.  +
Boechera fructicosa +
Flowering Jun–Jul.  +
Boechera glareosa +
Flowering May–Jun.  +
Boechera glaucovalvula +
Flowering Mar–Apr.  +
Boechera goodrichii +
Flowering Apr–May.  +
Boechera gracilenta +
Flowering Apr–May.  +
Boechera gracilipes +
Flowering Apr–Jun.  +
Boechera grahamii +
Flowering May–Aug.  +
Boechera gunnisoniana +
Flowering May–Jun.  +
Boechera harrisonii +
Flowering May–Jun.  +
Boechera hastatula +
Flowering Jun–Jul.  +
Boechera hoffmannii +
Flowering Feb–Mar.  +
Boechera holboellii +
Flowering Jul–Aug.  +
Boechera horizontalis +
Flowering Jul–Aug.  +
Boechera howellii +
Flowering Jun–Aug.  +
Boechera inyoensis +
Flowering Apr–Jun.  +
Boechera johnstonii +
Flowering Feb–Mar.  +
Boechera koehleri +
Flowering Apr–May.  +
Boechera laevigata +
Flowering Mar–May.  +
Boechera languida +
Flowering May–Jun.  +
Boechera lasiocarpa +
Flowering May–Jun.  +
Boechera lemmonii +
Flowering Jun–Aug.  +
Boechera lignifera +
Flowering Apr–May.  +
Boechera lincolnensis +
Flowering Apr–May.  +
Boechera lyallii +
Flowering Jun–Aug.  +
Boechera macounii +
Flowering May–Jul.  +
Boechera microphylla +
Flowering Apr–Jun.  +
Boechera missouriensis +
Flowering Mar–Jun.  +
Boechera nevadensis +
Flowering Jun.  +
Boechera ophira +
Flowering May–Jun.  +
Boechera oxylobula +
Flowering May–Jul.  +
Boechera paddoensis +
Flowering Jul–Aug.  +
Boechera pallidifolia +
Flowering Apr–Jun.  +
Boechera parishii +
Flowering Mar–May.  +
Boechera pauciflora +
Flowering May–Jun.  +
Boechera paupercula +
Flowering Jun–Aug.  +
Boechera peirsonii +
Flowering Jun–Sep.  +
Boechera pendulina +
Flowering Apr–Jun.  +
Boechera pendulocarpa +
Flowering Apr–Jul.  +
Boechera perennans +
Flowering Feb–May.  +
Boechera perstellata +
Flowering Apr–May.  +
Boechera pinetorum +
Flowering May–Jul.  +
Boechera pinzliae +
Flowering Jul.  +
Boechera platysperma +
Flowering Jun–Aug.  +
Boechera polyantha +
Flowering late Apr-early Jun.  +
Boechera porphyrea +
Flowering late Mar-early May.  +
Boechera pratincola +
Flowering Jun–Aug.  +
Boechera puberula +
Flowering Apr–Jul.  +
Boechera pulchra +
Flowering Mar–Jun.  +
Boechera pusilla +
Flowering May–Jun.  +
Boechera pygmaea +
Flowering May–Jul.  +
Boechera quebecensis +
Flowering Jun–Jul.  +
Boechera rectissima +
Flowering May–Jul.  +
Boechera repanda +
Flowering Jun–Jul.  +
Boechera retrofracta +
Flowering Apr–Aug.  +
Boechera rigidissima +
Flowering Jul–Aug.  +
Boechera rollei +
Flowering Aug.  +
Boechera rollinsiorum +
Flowering Jun.  +
Boechera rubicundula +
Flowering Apr–May.  +
Boechera saximontana +
Flowering Jun–Jul.  +
Boechera schistacea +
Flowering May–Jul.  +
Boechera serotina +
Flowering Jul–Sep.  +
Boechera serpenticola +
Flowering Mar–Jun.  +
Boechera shevockii +
Flowering Jun.  +
Boechera shockleyi +
Flowering Apr–May.  +
Boechera sparsiflora +
Flowering Apr–Jun.  +
Boechera spatifolia +
Flowering May–Aug.  +
Boechera stricta +
Flowering May–Aug.  +
Boechera subpinnatifida +
Flowering Mar–May.  +
Boechera suffrutescens +
Flowering Jun–Aug.  +
Boechera texana +
Flowering Apr.  +
Boechera tiehmii +
Flowering Jun–Aug.  +
Boechera tularensis +
Flowering Jun–Jul.  +
Boechera ultra-alsa +
Flowering Jun–Jul.  +
Boechera villosa +
Flowering May.  +
Boechera williamsii +
Flowering May–Jun.  +
Boechera xylopoda +
Flowering Mar–May.  +
Boechera yorkii +
Flowering May.  +
Boehmeria cylindrica +
Flowering summer–fall.  +
Boehmeria nivea +
Flowering late summer–fall.  +
Boerhavia anisophylla +
Flowering mid summer–early fall.  +
Boerhavia ciliata +
Flowering late spring-mid fall.  +
Boerhavia coccinea +
Flowering spring–winter [year-round].  +
Boerhavia coulteri var. coulteri +
Flowering late spring–early fall.  +
Boerhavia coulteri var. palmeri +
Flowering mid summer–early fall.  +
Boerhavia diffusa +
Flowering mid winter–early fall [year-round].  +
Boerhavia erecta +
Flowering early summer-mid fall.  +
Boerhavia gracillima +
Flowering mid summer–late fall.  +
Boerhavia intermedia +
Flowering summer–late fall.  +
Boerhavia linearifolia +
Flowering mid spring–late summer.  +
Boerhavia megaptera +
Flowering summer–fall.  +
Boerhavia pterocarpa +
Flowering late summer.  +
Boerhavia purpurascens +
Flowering late summer.  +
Boerhavia spicata +
Flowering late summer–early fall.  +
Boerhavia torreyana +
Flowering mid summer and early fall.  +
Boerhavia triquetra +
Flowering summer–late fall.  +
Boerhavia wrightii +
Flowering summer.  +
Bolandra californica +
Flowering Jun–Jul.  +
Bolandra oregana +
Flowering May–Jul.  +
Bolboschoenus fluviatilis +
Fruiting summer.  +
Bolboschoenus glaucus +
Fruiting summer.  +
Bolboschoenus maritimus subsp. maritimus +
Fruiting summer.  +
Bolboschoenus maritimus subsp. paludosus +
Fruiting spring–fall (south and lowland California), summer (north).  +
Bolboschoenus novae-angliae +
Fruiting summer.  +
Bolboschoenus robustus +
Fruiting spring–fall (south), summer (north).  +
Boltonia apalachicolensis +
Flowering late Sep–Dec.  +
Boltonia asteroides var. asteroides +
Flowering Jul–Nov.  +
Boltonia asteroides var. latisquama +
Flowering Aug–Sep.  +
Boltonia asteroides var. recognita +
Flowering Aug–Sep.  +
Boltonia caroliniana +
Flowering Aug–Oct.  +
Boltonia decurrens +
Flowering Aug–Sep.  +
Boltonia diffusa var. diffusa +
Flowering Jul–Nov.  +
Boltonia diffusa var. interior +
Flowering Sep–Oct.  +
Bommeria hispida +
Sporulating summer–fall.  +
Bonamia grandiflora +
Flowering summer–early fall.  +
Bonamia ovalifolia +
Flowering summer–fall.  +
Bonellia macrocarpa subsp. macrocarpa +
Flowering year-round.  +
Bontia daphnoides +
Flowering Nov–Jun.  +
Borrichia arborescens +
Flowering late spring–summer.  +
Borrichia frutescens +
Flowering late spring–summer.  +
Borrichia ×cubana +
Flowering late spring–summer.  +
Boschniakia rossica +
Flowering Jun–Aug.  +
Botrychium acuminatum +
Leaves appearing in midspring, dying in fall.  +
Botrychium ascendens +
Leaves appearing in late spring to midsummer.  +
Botrychium biternatum +
Leaves green over winter, sporophores seasonal, new leaves appearing in late spring–early summer.  +
Botrychium boreale +
Leaves appearing in July and August.  +
Botrychium campestre +
Leaves appearing in early spring and dying in late spring and early summer, long before those of associated moonworts.  +
Botrychium crenulatum +
Leaves appearing in mid to late spring, dying in late summer  +, in extremely dry years of shorter duration or not appearing at all.  +
Botrychium dissectum +
Leaves green over winter, new leaves appearing in late spring.  +
Botrychium echo +
Leaves appearing in June, dying in September.  +
Botrychium gallicomontanum +
Leaves appearing in midspring, dying in summer.  +
Botrychium hesperium +
Leaves appearing in midspring, dying in early fall.  +
Botrychium jenmanii +
Leaves green over winter, arising at variable times during last half of summer, meiosis as late as September.  +
Botrychium lanceolatum subsp. angustisegmentum +
Leaves appearing in late spring or early summer, releasing spores later than most associated species, and dying as late as October.  +
Botrychium lanceolatum subsp. lanceolatum +
Leaves usually drying up in midsummer together with other associated species.  +
Botrychium lunaria +
Leaves appearing in spring, dying in latter half of summer.  +
Botrychium lunarioides +
Leaves appearing in late fall and dying in early spring.  +
Botrychium matricariifolium +
Leaves appearing in spring, dying in late summer.  +
Botrychium minganense +
Leaves appearing in spring through summer.  +
Botrychium montanum +
Leaves appearing in late spring to late summer.  +
Botrychium mormo +
Leaves appearing in late spring to fall.  +
Botrychium multifidum +
Leaves green over winter, appearing in spring.  +
Botrychium oneidense +
Leaves green over winter, sporophores seasonal, new leaves appearing in spring.  +
Botrychium pallidum +
Leaves appearing in late spring and early summer.  +
Botrychium pedunculosum +
Leaves appearing in late spring, dying in early fall.  +
Botrychium pinnatum +
Leaves appearing in June to August.  +
Botrychium pseudopinnatum +
Leaves appearing in late spring to early fall.  +
Botrychium pumicola +
Leaves appearing in summer.  +
Botrychium rugulosum +
Leaves green over winter, appearing in midspring.  +
Botrychium simplex +
Leaves appearing midspring to early fall.  +
Botrychium spathulatum +
Leaves appearing late spring through summer.  +
Botrychium virginianum +
Leaves seasonal, appearing in early spring and dying in late summer.  +
Bouchetia erecta +
Flowering Mar–Nov.  +
Boykinia aconitifolia +
Flowering summer.  +
Boykinia intermedia +
Flowering summer.  +
Boykinia major +
Flowering summer(-early autumn).  +
Boykinia occidentalis +
Flowering summer.  +
Boykinia richardsonii +
Flowering summer.  +
Boykinia rotundifolia +
Flowering early-mid summer.  +
Brachychiton populneus +
Flowering (Jan–)May–Jul(–Nov).  +
Brachymenium macrocarpum +
Capsules mature Apr–Aug (spring–summer).  +
Brachystigma wrightii +
Flowering Aug–Oct  +, fruiting Oct–Dec.  +
Bradburia hirtella +
Flowering late spring–early summer.  +
Bradburia pilosa +
Flowering late spring–early summer.  +
Brandegea bigelovii +
Flowering (Feb–)Mar–Apr(–later sporadically).  +
Brasenia schreberi +
Flowering late spring–summer.  +
Brassia caudata +
Flowering winter–summer (Jan–Aug).  +
Brassica elongata +
Flowering Jun–Jul.  +
Brassica fruticulosa +
Flowering Dec–Mar.  +
Brassica juncea +
Flowering May–Sep.  +
Brassica napus +
Flowering May–Sep.  +
Brassica nigra +
Flowering Apr–Sep.  +
Brassica oleracea +
Flowering May–Aug.  +
Brassica rapa +
Flowering Apr–Sep.  +
Brassica tournefortii +
Flowering Feb–Apr.  +
Braunia andrieuxii +
Capsules mature spring.  +
Braunia secunda +
Capsules mature spring.  +
Braya fernaldii +
Flowering Jun–Jul.  +
Braya glabella subsp. glabella +
Flowering Jun–Jul.  +
Braya glabella subsp. prostrata +
Flowering Jun–Jul.  +
Braya glabella subsp. purpurascens +
Flowering Jun–Jul.  +
Braya humilis subsp. ellesmerensis +
Flowering Jun–Jul, fruiting Jul–Aug.  +
Braya humilis subsp. humilis +
Flowering May–Jul.  +
Braya humilis subsp. maccallae +
Flowering May–Jul.  +
Braya humilis subsp. porsildii +
Flowering May–Jul.  +
Braya linearis +
Flowering Jun–Jul.  +
Braya longii +
Flowering Jun–Jul.  +
Braya pilosa +
Flowering Jul–Aug.  +
Braya thorild-wulffii subsp. glabrata +
Flowering Jul.  +
Braya thorild-wulffii subsp. thorild-wulffii +
Flowering Jul.  +
Breynia disticha +
Flowering and fruiting summer.  +
Brickellia amplexicaulis +
Flowering Sep–Dec.  +
Brickellia atractyloides var. arguta +
Flowering Apr–Jun.  +
Brickellia atractyloides var. atractyloides +
Flowering Mar–Sep.  +
Brickellia atractyloides var. odontolepis +
Flowering Apr–Jun.  +
Brickellia baccharidea +
Flowering Oct–Apr.  +
Brickellia betonicifolia +
Flowering Jul–Oct.  +
Brickellia brachyphylla +
Flowering Jul–Oct.  +
Brickellia californica +
Flowering Jul–Oct.  +
Brickellia chenopodina +
Flowering Aug–Oct.  +
Brickellia cordifolia +
Flowering Aug–Oct.  +
Brickellia coulteri var. brachiata +
Flowering Mar–Oct.  +
Brickellia coulteri var. coulteri +
Flowering Mar–Oct.  +
Brickellia cylindracea +
Flowering Jun–Nov.  +
Brickellia dentata +
Flowering Aug–Nov.  +
Brickellia desertorum +
Flowering Sep–Mar.  +
Brickellia eupatorioides var. chlorolepis +
Flowering May–Oct.  +
Brickellia eupatorioides var. corymbulosa +
Flowering May–Oct.  +
Brickellia eupatorioides var. eupatorioides +
Flowering May–Oct.  +
Brickellia eupatorioides var. floridana +
Flowering Jun–Sep.  +
Brickellia eupatorioides var. gracillima +
Flowering Aug–Nov, Apr.  +
Brickellia eupatorioides var. texana +
Flowering Aug–Nov.  +
Brickellia floribunda +
Flowering Aug–Oct.  +
Brickellia frutescens +
Flowering Mar–Jun.  +
Brickellia grandiflora +
Flowering Jul–Oct.  +
Brickellia greenei +
Flowering Jul–Sep.  +
Brickellia hinckleyi var. hinckleyi +
Flowering Jul–Oct.  +
Brickellia hinckleyi var. terlinguensis +
Flowering Jul–Oct.  +
Brickellia incana +
Flowering May–Oct.  +
Brickellia knappiana +
Flowering Sep–Oct.  +
Brickellia laciniata +
Flowering Aug–Nov.  +
Brickellia lemmonii var. conduplicata +
Flowering Aug–Nov.  +
Brickellia lemmonii var. lemmonii +
Flowering Aug–Nov.  +
Brickellia longifolia var. longifolia +
Flowering Sep–Nov.  +
Brickellia longifolia var. multiflora +
Flowering Sep–Nov.  +
Brickellia microphylla var. microphylla +
Flowering Jul–Oct.  +
Brickellia microphylla var. scabra +
Flowering Jul–Oct.  +
Brickellia nevinii +
Flowering Aug–Nov.  +
Brickellia oblongifolia var. linifolia +
Flowering May–Aug.  +
Brickellia oblongifolia var. oblongifolia +
Flowering May–Aug.  +
Brickellia parvula +
Flowering Aug–Oct.  +
Brickellia pringlei +
Flowering Apr–Jun.  +
Brickellia rusbyi +
Flowering Aug–Oct.  +
Brickellia simplex +
Flowering Aug–Oct.  +
Brickellia venosa +
Flowering Aug–Oct.  +
Brickellia veronicifolia +
Flowering Sep–Oct.  +
Brickelliastrum fendleri +
Flowering Jul–Sep(–Oct).  +
Brintonia discoidea +
Flowering Aug–Oct.  +
Brodiaea appendiculata +
Flowering spring (Apr–May).  +
Brodiaea californica subsp. californica +
Flowering spring (late May–early Jun).  +
Brodiaea californica subsp. leptandra +
Flowering summer (Jun).  +
Brodiaea coronaria subsp. coronaria +
Flowering spring (Apr–Jun).  +
Brodiaea coronaria subsp. rosea +
Flowering spring (late May–Jun).  +
Brodiaea elegans subsp. elegans +
Flowering spring–summer (May–Jul).  +
Brodiaea elegans subsp. hooveri +
Flowering spring.  +
Brodiaea filifolia +
Flowering spring (Apr–May).  +
Brodiaea insignis +
Flowering spring (May–Jun).  +
Brodiaea jolonensis +
Flowering spring (Apr–May).  +
Brodiaea kinkiensis +
Flowering spring (May–Jun).  +
Brodiaea minor +
Flowering spring (Apr–early May).  +
Brodiaea orcuttii +
Flowering spring (May).  +
Brodiaea pallida +
Flowering spring (late May–early Jun).  +
Brodiaea purdyi +
Flowering spring (Jun).  +
Brodiaea stellaris +
Flowering spring (May–Jun).  +
Brodiaea terrestris subsp. kernensis +
Flowering spring (Apr–Jun).  +
Brodiaea terrestris subsp. terrestris +
Flowering spring (Apr–Jun).  +
Brosimum alicastrum +
Flowering all year.  +
Brotherella canadensis +
Capsules mature late fall–early spring.  +
Brotherella henonii +
Capsule maturity unknown.  +
Brotherella recurvans +
Capsules mature late fall.  +
Brotherella roellii +
Capsules mature winter.  +
Broussonetia papyrifera +
Flowering spring.  +
Browallia americana +
Flowering Jun–Aug.  +
Browallia eludens +
Flowering Jul–Sep.  +
Bruchia bolanderi +
Capsules mature summer.  +
Bruchia brevifolia +
Capsules mature early spring.  +
Bruchia carolinae +
Capsules mature late winter–spring.  +
Bruchia drummondii +
Capsules mature spring.  +
Bruchia flexuosa +
Capsules mature spring–summer.  +
Bruchia fusca +
Capsules mature spring.  +
Bruchia hallii +
Capsules mature late winter–spring.  +
Bruchia ravenelii +
Capsules mature winter.  +
Bruchia texana +
Capsules mature spring.  +
Bruchia vogesiaca +
Capsules mature summer.  +
Brunnichia ovata +
Flowering Jun–Jul.  +
Bryocrumia vivicolor +
Capsule maturity unknown.  +
Bryoerythrophyllum columbianum +
Sporophytes rare, capsules mature early spring (Mar).  +
Bryoerythrophyllum ferruginascens +
Sporophytes unknown for the region of the flora.  +
Bryoerythrophyllum inaequalifolium +
Sporophytes absent in the area of the flora.  +
Bryoerythrophyllum recurvirostrum +
Capsules mature summer–fall (Jun–Sep).  +
Bryolawtonia vancouveriensis +
Capsules mature spring.  +
Bryonia alba +
Flowering Jun–Aug.  +
Bryonia dioica +
Flowering Jun–Aug.  +
Bryophyllum daigremontianum +
Flowering winter.  +
Bryophyllum delagoense +
Flowering winter, spring.  +
Bryophyllum fedtschenkoi +
Flowering winter–spring.  +
Bryophyllum gastonis-bonnieri +
Flowering winter.  +
Bryophyllum pinnatum +
Flowering winter–spring.  +
Bryoxiphium norvegicum +
Capsules mature Jul.  +
Bryum argenteum var. argenteum +
Capsules mature Apr–Jul (spring–summer).  +
Bryum argenteum var. majus +
Capsules unknown.  +
Bryum argenteum var. muticum +
Capsules unknown.  +
Bryum blindii +
Capsules mature Jun–Aug (summer).  +
Bryum lanatum +
Capsules mature May–Jul (spring–summer).  +
Bryum oblongum +
Capsules mature Jun–Aug (summer).  +
Buchnera americana +
Flowering May–Oct.  +
Buchnera floridana +
Flowering May–Oct.  +
Buchnera obliqua +
Flowering Aug–Sep.  +
Buckiella undulata +
Capsules mature summer.  +
Buckleya distichophylla +
Flowering Apr–May, Aug.  +
Buddleja davidii +
Flowering May–Oct  +, fruiting Jul–Nov.  +
Buddleja indica +
Flowering and fruiting year-round.  +
Buddleja lindleyana +
Flowering Jun–Oct  +, fruiting Aug–Nov.  +
Buddleja madagascariensis +
Flowering Mar–May  +, fruiting not known in continental United States.  +
Buddleja marrubiifolia +
Flowering Feb–Aug  +, fruiting Jul–Oct.  +
Buddleja racemosa var. incana +
Flowering May–Aug  +, fruiting Jul–Oct.  +
Buddleja racemosa var. racemosa +
Flowering May–Aug  +, fruiting Jul–Oct.  +
Buddleja saligna +
Flowering May–Sep  +, fruiting Jul–Oct.  +
Buddleja scordioides +
Flowering May–Aug  +, fruiting Sep–Nov.  +
Buddleja sessiliflora +
Flowering Jan–Apr  +, fruiting Mar–Jun.  +
Buddleja utahensis +
Flowering Apr–Aug  +, fruiting Jun–Sep.  +
Bulbophyllum pachyrachis +
Flowering Nov–Dec.  +
Bulbostylis barbata +
Fruiting summer–fall.  +
Bulbostylis capillaris +
Fruiting summer–fall.  +
Bulbostylis ciliatifolia var. ciliatifolia +
Fruiting summer–fall.  +
Bulbostylis ciliatifolia var. coarctata +
Fruiting summer–fall.  +
Bulbostylis funckii +
Fruiting all year.  +
Bulbostylis juncoides +
Fruiting all year.  +
Bulbostylis schaffneri +
Fruiting all year.  +
Bulbostylis stenophylla +
Fruiting summer–fall.  +
Bulbostylis warei +
Fruiting summer–fall.  +
Bunias erucago +
Flowering Apr–Jun.  +
Bunias orientalis +
Flowering Jun–Aug.  +
Burmannia biflora +
Flowering summer–fall.  +
Burmannia capitata +
Flowering mostly late summer–fall.  +
Burmannia flava +
Flowering fall (Oct).  +
Butomus umbellatus +
Flowering summer–fall.  +
Buxbaumia aphylla +
Capsules mature late spring–fall.  +
Buxbaumia minakatae +
Capsules mature late summer–fall.  +
Buxbaumia piperi +
Capsules mature late summer–fall.  +
Buxbaumia viridis +
Capsules mature late summer–fall.  +
Buxus sempervirens +
Flowering spring  +, fruiting late summer–fall.  +
Byrsonima lucida +
Flowering most commonly Jan–Jun  +, fruiting Feb–Jul.  +
C
Cabomba caroliniana +
Flowering late spring–early fall, earlier and later further south.  +
Cacaliopsis nardosmia +
Flowering Apr–Jul.  +
Cakile constricta +
Flowering spring–fall.  +
Cakile edentula subsp. harperi +
Flowering Mar–Oct.  +
Cakile edentula var. edentula +
Flowering Jun–Nov.  +
Cakile edentula var. lacustris +
Flowering May–Oct.  +
Cakile geniculata +
Flowering year-round (peak Mar–Aug).  +
Cakile lanceolata subsp. fusiformis +
Flowering year-round.  +
Cakile lanceolata subsp. lanceolata +
Flowering year-round.  +
Cakile lanceolata subsp. pseudoconstricta +
Flowering year-round.  +
Cakile maritima subsp. maritima +
Flowering late spring–fall(-winter if mild).  +
Calandrinia breweri +
Flowering spring.  +
Calandrinia ciliata +
Flowering spring.  +
Calendula arvensis +
Flowering Feb–Apr.  +
Calendula officinalis +
Flowering year-round.  +
Calepina irregularis +
Flowering Mar–May.  +
Calibrachoa parviflora +
Flowering Mar–Nov.  +
Calla palustris +
Flowering late spring–summer.  +
Callaeum septentrionale +
Flowering year-round, most commonly May–Sep  +, fruiting Jun–Oct.  +
Callicladium haldaneanum +
Capsules mature fall–winter.  +
Callicostella pallida +
Capsules mature winter (late Dec–Mar).  +
Calliphysalis carpenteri +
Flowering (late Apr–)Jun–Aug(–Sep).  +
Callirhoë alcaeoides +
Flowering spring–summer.  +
Callirhoë bushii +
Flowering late spring–summer(–early fall).  +
Callirhoë digitata +
Flowering spring–late summer.  +
Callirhoë involucrata var. involucrata +
Flowering spring–early fall.  +
Callirhoë involucrata var. lineariloba +
Flowering late winter–summer, sporadically later.  +
Callirhoë leiocarpa +
Flowering (late winter–)spring–mid summer, sporadically later.  +
Callirhoë papaver +
Flowering spring–summer.  +
Callirhoë pedata +
Flowering spring–summer.  +
Callirhoë scabriuscula +
Flowering spring.  +
Callirhoë triangulata +
Flowering spring–summer.  +
Callisia cordifolia +
Flowering spring–fall.  +
Callisia fragrans +
Flowering late winter (Feb).  +
Callisia graminea +
Flowering spring–fall.  +
Callisia micrantha +
Flowering spring–fall (May–Sep).  +
Callisia ornata +
Flowering spring, fall.  +
Callisia repens +
Flowering early spring (Tex) or summer–fall (Fla.).  +
Callisia rosea +
Flowering spring–early summer.  +
Callitriche brutia var. hamulata +
Flowering Jul–Sep.  +
Callitriche fassettii +
Flowering Apr–May(–Jul).  +
Callitriche hermaphroditica +
Flowering Jul–Sep(–Nov).  +
Callitriche heterophylla +
Flowering Feb–Nov.  +
Callitriche longipedunculata +
Flowering Mar–May.  +
Callitriche marginata +
Flowering Apr–Aug.  +
Callitriche palustris +
Flowering May–Oct.  +
Callitriche pedunculosa +
Flowering Feb–Jun(Sep–Oct).  +
Callitriche peploides +
Flowering (Jan–)Feb–Apr(–May), Oct–Dec.  +
Callitriche stagnalis +
Flowering May–Oct.  +
Callitriche stenoptera +
Flowering Jun–Sep.  +
Callitriche terrestris +
Flowering Apr–Jul(–Aug), Nov–Dec.  +
Callitriche trochlearis +
Flowering Apr–Jul.  +
Calluna vulgaris +
Flowering late spring–summer.  +
Calochortus albus +
Flowering mid spring–mid summer.  +
Calochortus amabilis +
Flowering mid spring–mid summer.  +
Calochortus ambiguus +
Flowering late spring–summer.  +
Calochortus amoenus +
Flowering mid spring–mid summer.  +
Calochortus apiculatus +
Flowering summer.  +
Calochortus argillosus +
Flowering late spring–mid summer.  +
Calochortus aureus +
Flowering late spring–mid summer.  +
Calochortus bruneaunis +
Flowering late spring–summer.  +
Calochortus catalinae +
Flowering spring–early summer.  +
Calochortus clavatus var. avius +
Flowering late spring–mid summer.  +
Calochortus clavatus var. clavatus +
Flowering late spring–mid summer.  +
Calochortus clavatus var. gracilis +
Flowering late spring–mid summer.  +
Calochortus clavatus var. pallidus +
Flowering late spring–mid summer.  +
Calochortus clavatus var. recurvifolius +
Flowering late spring–mid summer.  +
Calochortus coeruleus +
Flowering late spring–mid summer.  +
Calochortus concolor +
Flowering late spring–mid summer.  +
Calochortus coxii +
Flowering mid summer.  +
Calochortus dunnii +
Flowering mid summer.  +
Calochortus elegans var. elegans +
Flowering late spring–mid summer.  +
Calochortus elegans var. nanus +
Flowering late spring–mid summer.  +
Calochortus elegans var. selwayensis +
Flowering late spring–mid summer.  +
Calochortus eurycarpus +
Flowering summer.  +
Calochortus excavatus +
Flowering spring.  +
Calochortus flexuosus +
Flowering spring.  +
Calochortus greenei +
Flowering mid summer.  +
Calochortus gunnisonii var. gunnisonii +
Flowering late spring–mid summer.  +
Calochortus gunnisonii var. perpulcher +
Flowering late spring–mid summer.  +
Calochortus howellii +
Flowering late spring–mid summer.  +
Calochortus indecorus +
Flowering late spring.  +
Calochortus invenustus +
Flowering late spring–late summer.  +
Calochortus kennedyi var. kennedyi +
Flowering mid spring–mid summer.  +
Calochortus kennedyi var. munzii +
Flowering mid spring–mid summer.  +
Calochortus leichtlinii +
Flowering late spring–late summer.  +
Calochortus longebarbatus var. longebarbatus +
Flowering late spring–mid summer.  +
Calochortus longebarbatus var. peckii +
Flowering late spring–mid summer.  +
Calochortus luteus +
Flowering late spring–mid summer.  +
Calochortus lyallii +
Flowering late spring–mid summer.  +
Calochortus macrocarpus var. macrocarpus +
Flowering late spring–mid summer.  +
Calochortus macrocarpus var. maculosus +
Flowering late spring–mid summer.  +
Calochortus minimus +
Flowering late spring–mid summer.  +
Calochortus monanthus +
Flowering late spring–mid summer.  +
Calochortus monophyllus +
Flowering spring.  +
Calochortus nitidus +
Flowering summer.  +
Calochortus nudus +
Flowering late spring–mid summer.  +
Calochortus nuttallii +
Flowering late spring–late summer.  +
Calochortus obispoensis +
Flowering late spring–mid summer.  +
Calochortus palmeri var. munzii +
Flowering late spring–mid summer.  +
Calochortus palmeri var. palmeri +
Flowering late spring–mid summer.  +
Calochortus panamintensis +
Flowering early–mid summer.  +
Calochortus persistens +
Flowering late spring–mid summer.  +
Calochortus plummerae +
Flowering late spring–mid summer.  +
Calochortus pulchellus +
Flowering late spring–early summer.  +
Calochortus raichei +
Flowering summer.  +
Calochortus simulans +
Flowering late spring–mid summer.  +
Calochortus splendens +
Flowering late spring–mid summer.  +
Calochortus striatus +
Flowering mid spring–early summer.  +
Calochortus subalpinus +
Flowering summer.  +
Calochortus superbus +
Flowering late spring–mid summer.  +
Calochortus tiburonensis +
Flowering late spring–early summer.  +
Calochortus tolmiei +
Flowering mid spring–mid summer.  +
Calochortus umbellatus +
Flowering early spring–early summer.  +
Calochortus umpquaensis +
Flowering late spring–mid summer.  +
Calochortus uniflorus +
Flowering late spring–mid summer.  +
Calochortus venustus +
Flowering mid spring–mid summer.  +
Calochortus vestae +
Flowering late spring–mid summer.  +
Calochortus weedii var. intermedius +
Flowering late spring–mid summer.  +
Calochortus weedii var. vestus +
Flowering mid summer.  +
Calochortus weedii var. weedii +
Flowering mid summer.  +
Calochortus westonii +
Flowering late spring.  +
Calophyllum inophyllum +
Flowering summer.  +
Calopogon barbatus +
Flowering spring, seldom winter (s Fla), late spring in north (Jan–Jun).  +
Calopogon multiflorus +
Flowering Mar–Apr, rarely Nov–Aug (s Fla only), usually several weeks following fires.  +
Calopogon oklahomensis +
Flowering Mar–Jul.  +
Calopogon pallidus +
Flowering Mar–Jun, rarely Jul–Aug.  +
Calopogon tuberosus var. simpsonii +
Flowering Nov–Jul, most commonly mid–late spring.  +
Calopogon tuberosus var. tuberosus +
Flowering Nov (s Fla)–Aug (north).  +
Caltha leptosepala +
Flowering late spring–summer (Jun–Aug).  +
Caltha natans +
Flowering late spring–summer (Jun–Aug).  +
Caltha palustris +
Flowering spring–summer (Apr–Jul).  +
Calycadenia fremontii +
Flowering spring–fall.  +
Calycadenia hooveri +
Flowering spring–summer.  +
Calycadenia micrantha +
Flowering usually Aug–fall.  +
Calycadenia mollis +
Flowering spring–summer.  +
Calycadenia multiglandulosa +
Flowering spring–fall.  +
Calycadenia oppositifolia +
Flowering spring–early summer.  +
Calycadenia pauciflora +
Flowering spring–late summer.  +
Calycadenia spicata +
Flowering summer.  +
Calycadenia truncata +
Flowering spring–fall.  +
Calycadenia villosa +
Flowering spring–summer.  +
Calycanthus floridus var. floridus +
Flowering late spring, fruiting mid fall.  +
Calycanthus floridus var. glaucus +
Flowering late spring, fruiting mid fall.  +
Calycanthus occidentalis +
Flowering late spring–early fall, fruiting mid fall.  +
Calycocarpum lyonii +
Flowering spring–summer.  +
Calycoseris parryi +
Flowering Apr–Jun.  +
Calycoseris wrightii +
Flowering Mar–Jun.  +
Calydorea coelestina +
Flowering mostly May–Jul.  +
Calypso bulbosa var. americana +
Flowering spring–early summer.  +
Calypso bulbosa var. occidentalis +
Flowering spring–early summer.  +
Calyptocarpus vialis +
Flowering ± year round.  +
Calyptranthes pallens +
Flowering late spring–mid summer.  +
Calyptranthes zuzygium +
Flowering late spring–early summer.  +
Calystegia atriplicifolia subsp. atriplicifolia +
Flowering May–Aug.  +
Calystegia atriplicifolia subsp. buttensis +
Flowering May–Jun.  +
Calystegia catesbeiana subsp. catesbeiana +
Flowering May–Jul.  +
Calystegia catesbeiana subsp. sericata +
Flowering Jun–Jul.  +
Calystegia collina subsp. apicum +
Flowering Apr–Jun.  +
Calystegia collina subsp. collina +
Flowering Apr–Jun.  +
Calystegia collina subsp. oxyphylla +
Flowering Apr–Jun.  +
Calystegia collina subsp. tridactylosa +
Flowering May–Jun.  +
Calystegia collina subsp. venusta +
Flowering May–Jun.  +
Calystegia felix +
Flowering Mar–Sep.  +
Calystegia hederacea +
Flowering May–Jul.  +
Calystegia longipes +
Flowering Apr–Jul.  +
Calystegia macounii +
Flowering May–Aug.  +
Calystegia macrostegia subsp. amplissima +
Flowering Feb–Aug.  +
Calystegia macrostegia subsp. arida +
Flowering Apr–Jul.  +
Calystegia macrostegia subsp. cyclostegia +
Flowering Apr–Oct.  +
Calystegia macrostegia subsp. intermedia +
Flowering Mar–Aug.  +
Calystegia macrostegia subsp. macrostegia +
Flowering Mar–Sep.  +
Calystegia macrostegia subsp. tenuifolia +
Flowering Apr–Sep.  +
Calystegia malacophylla subsp. malacophylla +
Flowering May–Aug.  +
Calystegia malacophylla subsp. pedicellata +
Flowering Apr–Jul.  +
Calystegia occidentalis subsp. fulcrata +
Flowering May–Jul(–Aug).  +
Calystegia occidentalis subsp. occidentalis +
Flowering (Apr–)May–Aug(–Sep).  +
Calystegia peirsonii +
Flowering May–Jun.  +
Calystegia pubescens +
Flowering Jun–Sep.  +
Calystegia purpurata subsp. purpurata +
Flowering Apr–Sep.  +
Calystegia purpurata subsp. saxicola +
Flowering Apr–Aug.  +
Calystegia sepium subsp. americana +
Flowering Jul–Oct.  +
Calystegia sepium subsp. angulata +
Flowering Jun–Sep.  +
Calystegia sepium subsp. appalachiana +
Flowering Jun–Sep.  +
Calystegia sepium subsp. binghamiae +
Flowering mostly Mar–Jul.  +
Calystegia sepium subsp. erratica +
Flowering Jun–Sep.  +
Calystegia sepium subsp. sepium +
Flowering Jun–Sep.  +
Calystegia silvatica subsp. disjuncta +
Flowering Jun–Oct.  +
Calystegia silvatica subsp. fraterniflora +
Flowering Jun–Oct.  +
Calystegia soldanella +
Flowering May–Aug.  +
Calystegia spithamaea subsp. purshiana +
Flowering May–Aug.  +
Calystegia spithamaea subsp. spithamaea +
Flowering May–Aug.  +
Calystegia spithamaea subsp. stans +
Flowering May–Aug.  +
Calystegia stebbinsii +
Flowering Apr–Jul.  +
Calystegia subacaulis subsp. episcopalis +
Flowering Apr–Jun.  +
Calystegia subacaulis subsp. subacaulis +
Flowering Apr–Jun.  +
Calystegia vanzuukiae +
Flowering Mar–Sep.  +
Camassia angusta +
Flowering mid–late spring.  +
Camassia cusickii +
Flowering mid–late spring.  +
Camassia howellii +
Flowering late spring.  +
Camassia leichtlinii subsp. leichtlinii +
Flowering late spring.  +
Camassia leichtlinii subsp. suksdorfii +
Flowering late spring.  +
Camassia quamash subsp. azurea +
Flowering mid–late spring.  +
Camassia quamash subsp. breviflora +
Flowering mid–late spring.  +
Camassia quamash subsp. intermedia +
Flowering mid–late spring.  +
Camassia quamash subsp. linearis +
Flowering mid–late spring.  +
Camassia quamash subsp. maxima +
Flowering mid–late spring.  +
Camassia quamash subsp. quamash +
Flowering mid–late spring.  +
Camassia quamash subsp. utahensis +
Flowering mid–late spring.  +
Camassia quamash subsp. walpolei +
Flowering mid–late spring.  +
Camassia scilloides +
Flowering mid–late spring.  +
Camelina alyssum +
Flowering May–June.  +
Camelina microcarpa +
Flowering May–Jul.  +
Camelina rumelica +
Flowering May–Jun.  +
Camelina sativa +
Flowering May–Jun.  +
Camissonia benitensis +
Flowering Apr–Jul.  +
Camissonia campestris subsp. campestris +
Flowering May–Jun.  +
Camissonia campestris subsp. obispoensis +
Flowering May–Jun.  +
Camissonia contorta +
Flowering Mar–Jul.  +
Camissonia integrifolia +
Flowering Apr–May.  +
Camissonia kernensis subsp. gilmanii +
Flowering Mar–Jul.  +
Camissonia kernensis subsp. kernensis +
Flowering Mar–Jul.  +
Camissonia lacustris +
Flowering Mar–Aug.  +
Camissonia parvula +
Flowering Apr–Jun.  +
Camissonia pubens +
Flowering Apr–Jun.  +
Camissonia pusilla +
Flowering Apr–Jun.  +
Camissonia sierrae subsp. alticola +
Flowering May–Jul.  +
Camissonia sierrae subsp. sierrae +
Flowering May–Jul.  +
Camissonia strigulosa +
Flowering Mar–Aug.  +
Camissoniopsis bistorta +
Flowering Mar–Jun.  +
Camissoniopsis cheiranthifolia subsp. cheiranthifolia +
Flowering Apr–Aug.  +
Camissoniopsis cheiranthifolia subsp. suffruticosa +
Flowering Jan–Aug.  +
Camissoniopsis confusa +
Flowering Mar–Jun(–Jul).  +
Camissoniopsis guadalupensis subsp. clementiana +
Flowering Mar–Jun(–Sep).  +
Camissoniopsis hardhamiae +
Flowering Mar–May.  +
Camissoniopsis hirtella +
Flowering (Jan–)Mar–Jul(–Nov).  +
Camissoniopsis ignota +
Flowering (Jan–)Mar–Apr(–Aug).  +
Camissoniopsis intermedia +
Flowering Mar–Jun(–Sep).  +
Camissoniopsis lewisii +
Flowering Mar–May(–Sep).  +
Camissoniopsis luciae +
Flowering Apr–May(–Jul).  +
Camissoniopsis micrantha +
Flowering (Jan–)Mar–Jun(–Sep).  +
Camissoniopsis pallida subsp. hallii +
Flowering Mar–May(–Jun).  +
Camissoniopsis pallida subsp. pallida +
Flowering (Jan–)Mar–Aug(–Nov).  +
Camissoniopsis robusta +
Flowering (Jan–)Mar–Jun(–Sep).  +
Campylocentrum pachyrrhizum +
Flowering Sep–Oct.  +
Campylostelium saxicola +
Capsules mature Oct–May.  +
Canadanthus modestus +
Flowering late summer–early fall.  +
Canbya aurea +
Flowering Apr–Jul.  +
Canbya candida +
Flowering Apr–Jun.  +
Canella winterana +
Flowering spring–summer (mid-May–Jul).  +
Canna flaccida +
Flowering primarily summer  +, fruiting shortly thereafter.  +
Canna glauca +
Flowering summer  +, fruiting summer–fall (Jun–Sep).  +
Canna indica +
Flowering primarily spring–summer  +, fruiting summer–early fall.  +
Cannabis sativa +
Flowering early summer–fall  +, staminate plants generally dying after anthesis, pistillate plants remaining dark green, persisting until frost.  +
Canotia holacantha +
Flowering spring to fall  +, fruiting late summer–winter, fruit persisting into spring.  +
Caperonia castaneifolia +
Flowering and fruiting Aug–Nov.  +
Caperonia palustris +
Flowering and fruiting Jul–Nov.  +
Capraria biflora +
Flowering fall–spring.  +
Capraria mexicana +
Flowering fall–spring.  +
Capsella bursa-pastoris +
Flowering and fruiting Jan–Oct.  +
Capsicum annuum var. glabriusculum +
Flowering Mar–Oct, sporadically year-round.  +
Cardamine angulata +
Flowering Apr–Jun.  +
Cardamine angustata +
Flowering Mar–May.  +
Cardamine bellidifolia +
Flowering Jun–Sep.  +
Cardamine blaisdellii +
Flowering Jul–Aug.  +
Cardamine breweri +
Flowering Jun–Jul.  +
Cardamine bulbosa +
Flowering Mar–Jun.  +
Cardamine californica +
Flowering Jan–May.  +
Cardamine clematitis +
Flowering May–Jun.  +
Cardamine concatenata +
Flowering Feb–May.  +
Cardamine constancei +
Flowering May–Jun.  +
Cardamine cordifolia +
Flowering May–Aug.  +
Cardamine digitata +
Flowering Jun–Aug.  +
Cardamine diphylla +
Flowering Apr–Jun.  +
Cardamine dissecta +
Flowering Mar–May.  +
Cardamine douglassii +
Flowering Mar–May.  +
Cardamine flagellifera +
Flowering Mar–Jun.  +
Cardamine flexuosa +
Flowering Apr–Jul.  +
Cardamine hirsuta +
Flowering Feb–Jul.  +
Cardamine holmgrenii +
Flowering Jul–Aug.  +
Cardamine impatiens +
Flowering May–Jul.  +
Cardamine longii +
Flowering Jun–Sep.  +
Cardamine macrocarpa +
Flowering Mar–Sep.  +
Cardamine maxima +
Flowering Apr–Jun.  +
Cardamine micranthera +
Flowering Apr–May.  +
Cardamine microphylla +
Flowering Jul–Aug.  +
Cardamine nuttallii +
Flowering Mar–May.  +
Cardamine nymanii +
Flowering Jun–Aug.  +
Cardamine occidentalis +
Flowering Apr–Jul.  +
Cardamine oligosperma +
Flowering Mar–Jul.  +
Cardamine pachystigma +
Flowering Mar–May.  +
Cardamine parviflora +
Flowering Mar–Jun.  +
Cardamine pattersonii +
Flowering May–Jun.  +
Cardamine penduliflora +
Flowering Mar–May.  +
Cardamine pensylvanica +
Flowering Apr–Jul.  +
Cardamine pratensis +
Flowering May–Aug.  +
Cardamine purpurea +
Flowering Jun–Aug.  +
Cardamine rotundifolia +
Flowering Apr–Jun.  +
Cardamine rupicola +
Flowering Jul–Aug.  +
Cardamine umbellata +
Flowering Jun–Sep.  +
Cardionema ramosissimum +
Flowering spring–early summer.  +
Carduus acanthoides subsp. acanthoides +
Flowering summer–early fall (Jun–Oct).  +
Carduus crispus +
Flowering summer–fall (Jul–Sep).  +
Carduus nutans +
Flowering late spring–summer (May–Sep).  +
Carduus pycnocephalus subsp. pycnocephalus +
Flowering spring–early summer (Mar–Jul).  +
Carduus tenuiflorus +
Flowering spring–early summer (Apr–Jul).  +
Carex aboriginum +
Fruiting early May–Jun.  +
Carex abrupta +
Fruiting summer.  +
Carex abscondita +
Fruiting summer.  +
Carex acidicola +
Fruiting spring.  +
Carex acutiformis +
Fruiting Jun–Aug.  +
Carex adelostoma +
Fruiting Jul–Aug.  +
Carex adusta +
Fruiting spring–summer.  +
Carex aestivalis +
Fruiting summer.  +
Carex aggregata +
Fruiting late spring.  +
Carex alata +
Fruiting late spring–mid summer.  +
Carex albicans var. albicans +
Fruiting mid Apr–early Jun.  +
Carex albicans var. australis +
Fruiting late Mar–mid May.  +
Carex albicans var. emmonsii +
Fruiting early May–mid Jun.  +
Carex albida +
Fruiting late spring–early summer.  +
Carex albolutescens +
Fruiting early–mid summer.  +
Carex albonigra +
Fruiting Jun–Aug.  +
Carex albursina +
Fruiting spring.  +
Carex alma +
Fruiting Jul–Aug.  +
Carex alopecoidea +
Fruiting Jul.  +
Carex amphibola +
Fruiting spring–early summer.  +
Carex amplectens +
Fruiting mid–late summer.  +
Carex amplifolia +
Fruiting late May–Sep.  +
Carex angustata +
Fruiting Jul–Aug.  +
Carex annectens +
Fruiting Jul–Aug.  +
Carex anthoxanthea +
Fruiting Jun–Aug.  +
Carex aperta +
Fruiting Jul–Aug.  +
Carex appalachica +
Fruiting late spring–early summer.  +
Carex aquatilis var. aquatilis +
Fruiting Jul–Aug.  +
Carex aquatilis var. dives +
Fruiting Jul–Aug.  +
Carex aquatilis var. minor +
Fruiting Jul–Aug.  +
Carex aquatilis var. substricta +
Fruiting Jul–Aug.  +
Carex arapahoensis +
Fruiting late summer.  +
Carex arcta +
Fruiting Jun–Sep.  +
Carex arctata +
Fruiting late spring–mid summer.  +
Carex arctiformis +
Fruiting May–Jun.  +
Carex arenaria +
Fruiting May–Jul.  +
Carex argyrantha +
Fruiting mid summer.  +
Carex arkansana +
Fruiting late spring.  +
Carex assiniboinensis +
Fruiting summer.  +
Carex atherodes +
Fruiting Jun–Aug.  +
Carex athrostachya +
Fruiting late spring–summer.  +
Carex atlantica subsp. atlantica +
Fruiting late spring–early summer.  +
Carex atlantica subsp. capillacea +
Fruiting late spring–early summer.  +
Carex atrata +
Fruiting Jul–Aug.  +
Carex atratiformis +
Fruiting Jun–Aug.  +
Carex atrofusca +
Fruiting summer.  +
Carex atrosquama +
Fruiting Jun–Aug.  +
Carex aurea +
Fruiting summer.  +
Carex aureolensis +
Fruiting summer.  +
Carex austrina +
Fruiting late spring–early summer.  +
Carex austrocaroliniana +
Fruiting spring.  +
Carex backii +
Fruiting spring–summer (late May–late Jul).  +
Carex baileyi +
Fruiting Jun–Aug.  +
Carex baltzellii +
Fruiting spring.  +
Carex barbarae +
Fruiting Jul–Aug.  +
Carex barrattii +
Fruiting late spring–early summer.  +
Carex basiantha +
Fruiting spring–summer (mid Mar–mid Jul).  +
Carex bebbii +
Fruiting early summer.  +
Carex bella +
Fruiting Jun–Aug.  +
Carex bicknellii +
Fruiting spring.  +
Carex bicolor +
Fruiting summer.  +
Carex bigelowii subsp. bigelowii +
Fruiting Aug–Sep.  +
Carex bigelowii subsp. lugens +
Fruiting Aug–Sep.  +
Carex biltmoreana +
Fruiting early summer.  +
Carex blanda +
Fruiting spring–early summer.  +
Carex bolanderi +
Fruiting spring–summer.  +
Carex bonanzensis +
Fruiting Jun–Aug.  +
Carex brainerdii +
Fruiting late May–late Jul.  +
Carex brevicaulis +
Fruiting late Mar–late Jun.  +
Carex brevior +
Fruiting early–mid summer.  +
Carex breweri +
Fruiting Aug–Sep.  +
Carex bromoides subsp. bromoides +
Fruiting spring–early summer.  +
Carex bromoides subsp. montana +
Fruiting spring.  +
Carex brunnescens subsp. brunnescens +
Fruiting May–Jul.  +
Carex brunnescens subsp. sphaerostachya +
Fruiting May–Jul.  +
Carex brysonii +
Fruiting spring.  +
Carex bulbostylis +
Fruiting spring.  +
Carex bullata +
Fruiting May–Aug.  +
Carex bushii +
Fruiting late spring–early summer.  +
Carex buxbaumii +
Fruiting May–Sep.  +
Carex calcifugens +
Fruiting spring.  +
Carex californica +
Fruiting early–mid summer.  +
Carex canescens subsp. canescens +
Fruiting Jun–Aug.  +
Carex canescens subsp. disjuncta +
Fruiting Apr–Jul.  +
Carex capillaris +
Fruiting late spring–mid summer.  +
Carex capitata +
Fruiting Jul–Aug.  +
Carex careyana +
Fruiting spring.  +
Carex caroliniana +
Fruiting late spring–early summer.  +
Carex caryophyllea +
Fruiting Jun.  +
Carex castanea +
Fruiting late spring–mid summer.  +
Carex cephaloidea +
Fruiting late spring–early summer.  +
Carex cephalophora +
Fruiting late spring–early summer.  +
Carex chalciolepis +
Fruiting Jun–Aug.  +
Carex chapmanii +
Fruiting spring.  +
Carex cherokeensis +
Fruiting late spring–early summer.  +
Carex chihuahuensis +
Fruiting Jun–Jul.  +
Carex chordorrhiza +
Fruiting late spring–summer.  +
Carex circinata +
Fruiting Jun–Aug.  +
Carex collinsii +
Fruiting Jul–Aug.  +
Carex communis var. amplisquama +
Fruiting late Apr–mid May.  +
Carex communis var. communis +
Fruiting late Apr–late Jun.  +
Carex comosa +
Fruiting Apr–Jul.  +
Carex complanata +
Fruiting late spring–early summer.  +
Carex concinna +
Fruiting spring–summer (late May–late Jul).  +
Carex concinnoides +
Fruiting spring–summer (late Apr–late Jul).  +
Carex congdonii +
Fruiting Jul.  +
Carex conjuncta +
Fruiting Jun.  +
Carex conoidea +
Fruiting spring–summer.  +
Carex constanceana +
Fruiting summer (Aug).  +
Carex cordillerana +
Fruiting spring–summer (late May–late Jul).  +
Carex corrugata +
Fruiting spring.  +
Carex crawei +
Fruiting late spring–late summer (May–mid Aug).  +
Carex crawfordii +
Fruiting late spring–summer.  +
Carex crebriflora +
Fruiting spring.  +
Carex crinita var. brevicrinis +
Fruiting Jun–Aug.  +
Carex crinita var. crinita +
Fruiting Jun–Aug.  +
Carex cristatella +
Fruiting summer.  +
Carex crus-corvi +
Fruiting May–Aug.  +
Carex cryptolepis +
Fruiting Jun–Aug.  +
Carex cumberlandensis +
Fruiting spring.  +
Carex cumulata +
Fruiting mid–late summer.  +
Carex curatorum +
Fruiting May–Jul.  +
Carex cusickii +
Fruiting Jun–early Sep.  +
Carex dasycarpa +
Fruiting early spring–summer.  +
Carex davisii +
Fruiting late spring–mid summer.  +
Carex davyi +
Fruiting late summer.  +
Carex debilis var. debilis +
Fruiting early–mid summer.  +
Carex debilis var. rudgei +
Fruiting summer.  +
Carex decomposita +
Fruiting mid Apr–Aug.  +
Carex deflexa var. boottii +
Fruiting early Jun–mid Aug.  +
Carex deflexa var. deflexa +
Fruiting mid May–late Aug.  +
Carex densa +
Fruiting Jun.  +
Carex deweyana var. collectanea +
Fruiting summer.  +
Carex deweyana var. deweyana +
Fruiting spring–summer.  +
Carex diandra +
Fruiting late May–mid Aug (Sep in Calif).  +
Carex digitalis var. digitalis +
Fruiting spring–early summer.  +
Carex digitalis var. floridana +
Fruiting spring.  +
Carex digitalis var. macropoda +
Fruiting spring.  +
Carex diluta +
Fruiting summer (Aug–early Sep).  +
Carex disperma +
Fruiting May–Aug.  +
Carex distans +
Fruiting late Jun–Jul.  +
Carex disticha +
Fruiting Jun–Jul.  +
Carex divisa +
Fruiting May–Jun.  +
Carex divulsa subsp. divulsa +
Fruiting late spring–early summer.  +
Carex douglasii +
Fruiting Jun–Aug.  +
Carex duriuscula +
Fruiting Jun–Aug.  +
Carex ebenea +
Fruiting summer.  +
Carex eburnea +
Fruiting late spring–mid summer.  +
Carex echinata subsp. echinata +
Fruiting late spring–early summer.  +
Carex echinata subsp. phyllomanica +
Fruiting late spring–early summer.  +
Carex edwardsiana +
Fruiting spring.  +
Carex egglestonii +
Fruiting summer.  +
Carex eleusinoides +
Fruiting Aug–Sep.  +
Carex elliottii +
Fruiting Apr–May.  +
Carex elynoides +
Fruiting spring–summer.  +
Carex emoryi +
Fruiting May–Jun.  +
Carex endlichii +
Fruiting May–Jun.  +
Carex engelmannii +
Fruiting Sep.  +
Carex epapillosa +
Fruiting Jun–Sep.  +
Carex exilis +
Fruiting late spring–early summer.  +
Carex exsiccata +
Fruiting Jun–Sep.  +
Carex extensa +
Fruiting Jun–Jul.  +
Carex festucacea +
Fruiting late spring–early summer.  +
Carex feta +
Fruiting late spring–summer.  +
Carex filifolia var. erostrata +
Fruiting spring–summer.  +
Carex filifolia var. filifolia +
Fruiting Apr–Jun.  +
Carex fissa var. aristata +
Fruiting late May.  +
Carex fissa var. fissa +
Fruiting late May.  +
Carex fissuricola +
Fruiting summer.  +
Carex flacca +
Fruiting Jul.  +
Carex flaccosperma +
Fruiting spring.  +
Carex flava +
Fruiting Jun–Aug.  +
Carex floridana +
Fruiting early Feb–late Apr.  +
Carex foenea +
Fruiting late spring–early summer.  +
Carex folliculata +
Fruiting late spring–summer.  +
Carex formosa +
Fruiting early–mid summer.  +
Carex fracta +
Fruiting late spring–summer.  +
Carex frankii +
Fruiting summer.  +
Carex fuliginosa +
Fruiting summer.  +
Carex garberi +
Fruiting summer.  +
Carex geophila +
Fruiting late Apr–late Jul.  +
Carex geyeri +
Fruiting late Apr–late Aug.  +
Carex gholsonii +
Fruiting late spring–early summer (late Mar–early Jun).  +
Carex gigantea +
Fruiting late spring–early summer.  +
Carex glacialis +
Fruiting summer.  +
Carex glareosa subsp. glareosa +
Fruiting Jun–Aug.  +
Carex glareosa subsp. pribylovensis +
Fruiting Jul–Aug.  +
Carex glaucescens +
Fruiting Jul–Aug.  +
Carex glaucodea +
Fruiting spring–early summer.  +
Carex globosa +
Fruiting mid Apr–late Jun.  +
Carex gmelinii +
Fruiting Jun–Sep.  +
Carex godfreyi +
Fruiting spring.  +
Carex gracilescens +
Fruiting spring.  +
Carex gracilior +
Fruiting spring–early summer.  +
Carex gracillima +
Fruiting late spring–mid summer.  +
Carex granularis +
Fruiting late spring–early summer (late Apr–Jul).  +
Carex gravida +
Fruiting late spring.  +
Carex grayi +
Fruiting May–Aug.  +
Carex grisea +
Fruiting spring–summer.  +
Carex gynandra +
Fruiting Jun–Aug.  +
Carex gynocrates +
Fruiting summer (Jun–Aug, Sep in subarctic Quebec and Greenland).  +
Carex gynodynama +
Fruiting late spring–early summer.  +
Carex halliana +
Fruiting Jun–Sep.  +
Carex hallii +
Fruiting May–Aug.  +
Carex harfordii +
Fruiting spring–summer.  +
Carex hassei +
Fruiting summer.  +
Carex haydeniana +
Fruiting summer.  +
Carex haydenii +
Fruiting Jun–Aug.  +
Carex heleonastes +
Fruiting Jun–Aug.  +
Carex helleri +
Fruiting Jul–Aug.  +
Carex hendersonii +
Fruiting spring–summer.  +
Carex heteroneura +
Fruiting Jun–Sep.  +
Carex heterostachya +
Fruiting Jun–Jul.  +
Carex hirsutella +
Fruiting late spring–early summer.  +
Carex hirta +
Fruiting Jun–Aug.  +
Carex hirtifolia +
Fruiting late spring–early summer.  +
Carex hirtissima +
Fruiting late spring–early summer.  +
Carex hitchcockiana +
Fruiting spring–summer.  +
Carex holostoma +
Fruiting Jul–Sep.  +
Carex hoodii +
Fruiting late spring–mid summer.  +
Carex hookeriana +
Fruiting late spring–early summer.  +
Carex hormathodes +
Fruiting mid summer.  +
Carex hostiana +
Fruiting Jul–Aug.  +
Carex houghtoniana +
Fruiting Jun–Aug.  +
Carex hyalina +
Fruiting spring.  +
Carex hyalinolepis +
Fruiting Apr–Jul.  +
Carex hystericina +
Fruiting May–Jul.  +
Carex idahoa +
Fruiting Jun–Sep.  +
Carex illota +
Fruiting summer.  +
Carex impressinervia +
Fruiting spring.  +
Carex incurviformis +
Fruiting Jun–Aug.  +
Carex infirminervia +
Fruiting (late spring–)summer.  +
Carex inops subsp. heliophila +
Fruiting mid Apr–early Jul.  +
Carex inops subsp. inops +
Fruiting late Apr–late Jul.  +
Carex integra +
Fruiting summer.  +
Carex interior +
Fruiting late spring–early summer.  +
Carex interrupta +
Fruiting Jul–Aug.  +
Carex intumescens +
Fruiting late spring–early summer.  +
Carex jamesii +
Fruiting spring–summer (early May–mid Jul).  +
Carex jonesii +
Fruiting Jul–Aug.  +
Carex joorii +
Fruiting Aug–Sep.  +
Carex juniperorum +
Fruiting spring–summer (early May–late Jun).  +
Carex kobomugi +
Fruiting spring–summer.  +
Carex kraliana +
Fruiting spring.  +
Carex krauseorum +
Fruiting summer.  +
Carex lachenalii +
Fruiting Jul–Aug.  +
Carex lacustris +
Fruiting May–Jul.  +
Carex laeviconica +
Fruiting May–Jul.  +
Carex laeviculmis +
Fruiting summer.  +
Carex laevivaginata +
Fruiting May–Jun.  +
Carex lapponica +
Fruiting early summer.  +
Carex lasiocarpa +
Fruiting Jun–Aug.  +
Carex latebracteata +
Fruiting spring (late Apr–late May).  +
Carex lativena +
Fruiting late spring.  +
Carex laxa +
Fruiting early–mid summer.  +
Carex laxiculmis var. copulata +
Fruiting spring–early summer.  +
Carex laxiculmis var. laxiculmis +
Fruiting spring–early summer.  +
Carex laxiflora +
Fruiting spring–early summer.  +
Carex leavenworthii +
Fruiting late spring.  +
Carex lemmonii +
Fruiting summer.  +
Carex lenticularis var. dolia +
Fruiting Aug–Sep.  +
Carex lenticularis var. impressa +
Fruiting Aug.  +
Carex lenticularis var. lenticularis +
Fruiting Jul–Aug.  +
Carex lenticularis var. limnophila +
Fruiting Aug.  +
Carex lenticularis var. lipocarpa +
Fruiting Aug.  +
Carex leporinella +
Fruiting mid–late summer.  +
Carex leptalea +
Fruiting Apr(mid Mar in Fla)–Aug(–Sep).  +
Carex leptonervia +
Fruiting spring–summer.  +
Carex leptopoda +
Fruiting spring–summer.  +
Carex limosa +
Fruiting summer.  +
Carex livida +
Fruiting late spring–early summer.  +
Carex loliacea +
Fruiting Jun–Jul.  +
Carex lonchocarpa +
Fruiting late spring–summer.  +
Carex longii +
Fruiting early–mid summer (fall in southern part of range).  +
Carex louisianica +
Fruiting late spring–summer.  +
Carex lucorum var. austrolucorum +
Fruiting late Apr–mid May.  +
Carex lucorum var. lucorum +
Fruiting mid May–early Jul.  +
Carex lupuliformis +
Fruiting late spring–summer.  +
Carex lupulina +
Fruiting late spring–summer.  +
Carex lurida +
Fruiting May–Aug.  +
Carex lutea +
Fruiting May–Jun.  +
Carex luzulifolia +
Fruiting summer.  +
Carex luzulina var. ablata +
Fruiting summer.  +
Carex luzulina var. luzulina +
Fruiting summer.  +
Carex lyngbyei +
Fruiting Jul–Aug.  +
Carex mackenziei +
Fruiting Jun–Aug.  +
Carex macloviana +
Fruiting summer–early fall.  +
Carex macrocephala +
Fruiting spring–summer.  +
Carex macrochaeta +
Fruiting summer.  +
Carex magellanica subsp. irrigua +
Fruiting summer.  +
Carex manhartii +
Fruiting spring–early summer.  +
Carex marina +
Fruiting Jul–Aug.  +
Carex mariposana +
Fruiting summer.  +
Carex maritima +
Fruiting Jun–Aug.  +
Carex mckittrickensis +
Fruiting summer.  +
Carex meadii +
Fruiting late spring–early summer.  +
Carex media +
Fruiting Jun–Aug.  +
Carex melanostachya +
Fruiting May–Jun.  +
Carex membranacea +
Fruiting summer.  +
Carex mendocinensis +
Fruiting late spring–summer.  +
Carex merritt-fernaldii +
Fruiting early–mid summer.  +
Carex mertensii +
Fruiting Jun–Aug.  +
Carex mesochorea +
Fruiting late spring–early summer.  +
Carex michauxiana +
Fruiting late spring–summer.  +
Carex microchaeta subsp. microchaeta +
Fruiting Jun–Aug.  +
Carex microchaeta subsp. nesophila +
Fruiting Jun–Aug.  +
Carex microdonta +
Fruiting spring–mid summer (Apr–Jul, Jun–Aug in Trans-Pecos, Texas).  +
Carex microglochin subsp. microglochin +
Fruiting summer (mid Jun–late Aug).  +
Carex micropoda +
Fruiting Jul–Aug.  +
Carex microptera +
Fruiting late spring–fall.  +
Carex misera +
Fruiting summer.  +
Carex missouriensis +
Fruiting early summer.  +
Carex mitchelliana +
Fruiting Jun–Aug.  +
Carex molesta +
Fruiting early summer.  +
Carex molestiformis +
Fruiting early summer.  +
Carex muehlenbergii var. enervis +
Fruiting late spring–early summer.  +
Carex muehlenbergii var. muehlenbergii +
Fruiting late spring–early summer.  +
Carex multicaulis +
Fruiting mid May–late Jul.  +
Carex multicostata +
Fruiting late spring–mid summer.  +
Carex muricata subsp. lamprocarpa +
Fruiting late spring–early summer.  +
Carex muriculata +
Fruiting Apr–Sep.  +
Carex muskingumensis +
Fruiting early–mid summer.  +
Carex nardina +
Fruiting Jul–Aug.  +
Carex nebrascensis +
Fruiting Jul–Aug.  +
Carex nelsonii +
Fruiting Jul–Aug.  +
Carex nervina +
Fruiting Jul–Aug.  +
Carex neurophora +
Fruiting Aug.  +
Carex nigra +
Fruiting Jul–Aug.  +
Carex nigricans +
Fruiting Jul–Aug.  +
Carex nigromarginata +
Fruiting early Apr–late Jun.  +
Carex normalis +
Fruiting early summer.  +
Carex norvegica +
Fruiting Jul–Aug.  +
Carex nova +
Fruiting Jun–Aug.  +
Carex novae-angliae +
Fruiting early Jun–early Jul.  +
Carex nudata +
Fruiting Jun–Jul.  +
Carex obispoensis +
Fruiting spring–early summer.  +
Carex obnupta +
Fruiting Jul–Aug.  +
Carex obtusata +
Fruiting Jun–Aug.  +
Carex occidentalis +
Fruiting spring–early summer.  +
Carex oklahomensis +
Fruiting May–Jun.  +
Carex oligocarpa +
Fruiting spring–early summer.  +
Carex oligosperma +
Fruiting summer.  +
Carex opaca +
Fruiting early summer.  +
Carex oreocharis +
Fruiting spring–summer.  +
Carex ormostachya +
Fruiting spring–summer.  +
Carex oronensis +
Fruiting summer (late Jun–mid Jul).  +
Carex ouachitana +
Fruiting spring.  +
Carex ovalis +
Fruiting summer.  +
Carex oxylepis +
Fruiting late spring–early summer.  +
Carex ozarkana +
Fruiting early summer.  +
Carex pachystachya +
Fruiting summer.  +
Carex paeninsulae +
Fruiting spring.  +
Carex paleacea +
Fruiting Jul–Sep.  +
Carex pallescens +
Fruiting summer.  +
Carex panicea +
Fruiting late spring–early summer.  +
Carex pansa +
Fruiting May–Jul.  +
Carex parallela subsp. parallela +
Fruiting late Jul–Sep.  +
Carex parryana +
Fruiting May–Aug.  +
Carex pauciflora +
Fruiting summer–fall (late May–early Sep).  +
Carex paysonis +
Fruiting May–Sep.  +
Carex peckii +
Fruiting mid May–mid Jul.  +
Carex pedunculata +
Fruiting spring–summer (mid Apr–early Jul).  +
Carex pellita +
Fruiting May–Aug.  +
Carex pelocarpa +
Fruiting Jul–Aug.  +
Carex pendula +
Fruiting spring–early summer.  +
Carex pensylvanica +
Fruiting early May–late Jul.  +
Carex perdentata +
Fruiting spring.  +
Carex perglobosa +
Fruiting Jul–Sep.  +
Carex petasata +
Fruiting summer.  +
Carex petricosa var. misandroides +
Fruiting summer.  +
Carex petricosa var. petricosa +
Fruiting summer.  +
Carex phaeocephala +
Fruiting summer.  +
Carex picta +
Fruiting spring.  +
Carex pigra +
Fruiting spring.  +
Carex pityophila +
Fruiting mid May–early Aug.  +
Carex planispicata +
Fruiting spring–early summer.  +
Carex planostachys +
Fruiting late spring.  +
Carex plantaginea +
Fruiting spring.  +
Carex platyphylla +
Fruiting spring.  +
Carex pluriflora +
Fruiting summer.  +
Carex podocarpa +
Fruiting Jun–Aug.  +
Carex polymorpha +
Fruiting early–mid summer.  +
Carex praeceptorum +
Fruiting Jul–Sep.  +
Carex praegracilis +
Fruiting May–Aug.  +
Carex prairea +
Fruiting Jun–Jul (Aug in w Canada).  +
Carex prasina +
Fruiting late spring–mid summer.  +
Carex praticola +
Fruiting spring–summer.  +
Carex preslii +
Fruiting summer.  +
Carex projecta +
Fruiting early–mid summer.  +
Carex proposita +
Fruiting summer.  +
Carex pseudocyperus +
Fruiting Jun–Aug.  +
Carex pumila +
Fruiting May–Jun.  +
Carex purpurifera +
Fruiting spring.  +
Carex radfordii +
Fruiting spring.  +
Carex radiata +
Fruiting mid–late spring.  +
Carex ramenskii +
Fruiting Jun–Aug.  +
Carex rariflora +
Fruiting summer.  +
Carex raynoldsii +
Fruiting Jun–Aug.  +
Carex recta +
Fruiting Jul–Aug.  +
Carex reniformis +
Fruiting late spring.  +
Carex retroflexa +
Fruiting spring.  +
Carex retrorsa +
Fruiting Jun–Aug.  +
Carex richardsonii +
Fruiting late spring–summer (late May–mid Jul).  +
Carex roanensis +
Fruiting early summer.  +
Carex rosea +
Fruiting mid–late spring.  +
Carex rossii +
Fruiting mid Apr–early Sep.  +
Carex rostrata +
Fruiting Jun–Aug.  +
Carex rotundata +
Fruiting Jul–Aug.  +
Carex rufina +
Fruiting Aug–Sep.  +
Carex rupestris +
Fruiting late spring–summer.  +
Carex ruthii +
Fruiting late spring–early summer.  +
Carex sabulosa +
Fruiting Jun–Aug.  +
Carex salina +
Fruiting Jul–Sep.  +
Carex sartwelliana +
Fruiting Jun–Aug.  +
Carex sartwellii +
Fruiting Jun–Jul.  +
Carex saxatilis +
Fruiting summer.  +
Carex saximontana +
Fruiting spring–summer (late May–mid Jul).  +
Carex scabrata +
Fruiting Jun (mid May in South)–early Sep.  +
Carex scabriuscula +
Fruiting late May–Jul.  +
Carex schottii +
Fruiting Jun.  +
Carex schweinitzii +
Fruiting Jun–Jul.  +
Carex scirpoidea subsp. convoluta +
Fruiting early Jun–Sep.  +
Carex scirpoidea subsp. pseudoscirpoidea +
Fruiting Jun–Sep (depending on elevation).  +
Carex scirpoidea subsp. scirpoidea +
Fruiting late May–Sep, depending on elevation.  +
Carex scirpoidea subsp. stenochlaena +
Fruiting late May–Sep.  +
Carex scoparia var. scoparia +
Fruiting late spring–summer.  +
Carex scoparia var. tessellata +
Fruiting early–mid summer.  +
Carex scopulorum var. bracteosa +
Fruiting Aug–Sep.  +
Carex scopulorum var. prionophylla +
Fruiting Jul–Aug.  +
Carex scopulorum var. scopulorum +
Fruiting Aug–Sep.  +
Carex senta +
Fruiting Jun.  +
Carex seorsa +
Fruiting late spring–early summer.  +
Carex serpenticola +
Fruiting mid Apr–mid Jun.  +
Carex serratodens +
Fruiting May–Jul.  +
Carex sheldonii +
Fruiting Jun–Sep.  +
Carex shinnersii +
Fruiting early summer.  +
Carex shortiana +
Fruiting late spring–summer (May–late Jul).  +
Carex siccata +
Fruiting May–Jul.  +
Carex silicea +
Fruiting early–mid summer.  +
Carex simulata +
Fruiting Jun–Aug.  +
Carex socialis +
Fruiting mid–late spring.  +
Carex sparganioides +
Fruiting late spring–early summer.  +
Carex specifica +
Fruiting summer.  +
Carex spectabilis +
Fruiting Jul–Sep.  +
Carex specuicola +
Fruiting Jun–Sep.  +
Carex spicata +
Fruiting late spring–early summer.  +
Carex spissa +
Fruiting Apr–Jun.  +
Carex sprengelii +
Fruiting early to mid summer.  +
Carex squarrosa +
Fruiting summer.  +
Carex stenoptila +
Fruiting late summer.  +
Carex sterilis +
Fruiting late spring–early summer.  +
Carex stevenii +
Fruiting Jun–Aug.  +
Carex stipata var. maxima +
Fruiting Apr–Jun.  +
Carex stipata var. stipata +
Fruiting Jun–Aug.  +
Carex straminea +
Fruiting early summer.  +
Carex straminiformis +
Fruiting summer.  +
Carex striata +
Fruiting Apr–Jul.  +
Carex striatula +
Fruiting spring.  +
Carex stricta +
Fruiting May–Jun.  +
Carex styloflexa +
Fruiting spring.  +
Carex stylosa +
Fruiting Jun–Sep.  +
Carex subbracteata +
Fruiting spring–summer.  +
Carex suberecta +
Fruiting early summer.  +
Carex subfusca +
Fruiting summer.  +
Carex subnigricans +
Fruiting Sep.  +
Carex subspathacea +
Fruiting Jun–Aug.  +
Carex superata +
Fruiting spring–summer (late Mar–mid Jul).  +
Carex supina subsp. spaniocarpa +
Fruiting summer.  +
Carex swanii +
Fruiting late spring–early summer.  +
Carex sychnocephala +
Fruiting summer–fall.  +
Carex sylvatica +
Fruiting summer.  +
Carex tahoensis +
Fruiting summer–early fall.  +
Carex tenax +
Fruiting late spring–summer.  +
Carex tenera var. echinodes +
Fruiting late spring–early summer.  +
Carex tenera var. tenera +
Fruiting late spring–early summer.  +
Carex tenuiflora +
Fruiting May–Aug.  +
Carex tetanica +
Fruiting late spring–early summer.  +
Carex tetrastachya +
Fruiting spring.  +
Carex texensis +
Fruiting spring.  +
Carex thornei +
Fruiting spring.  +
Carex thurberi +
Fruiting May–Aug.  +
Carex timida +
Fruiting spring–summer (May–Jul).  +
Carex tincta +
Fruiting summer.  +
Carex tompkinsii +
Fruiting late May–late Jun.  +
Carex tonsa var. rugosperma +
Fruiting mid Apr–late Jun.  +
Carex tonsa var. tonsa +
Fruiting mid Apr–early Jul.  +
Carex torreyi +
Fruiting summer.  +
Carex torta +
Fruiting Jun.  +
Carex triangularis +
Fruiting Jun.  +
Carex tribuloides var. sangamonensis +
Fruiting early–mid summer.  +
Carex tribuloides var. tribuloides +
Fruiting early–mid summer.  +
Carex trichocarpa +
Fruiting May–Jul.  +
Carex triquetra +
Fruiting late spring.  +
Carex trisperma +
Fruiting Jun–Aug.  +
Carex tuckermanii +
Fruiting Jun–Aug.  +
Carex tumulicola +
Fruiting late spring–early summer.  +
Carex turbinata +
Fruiting mid Jul–mid Aug.  +
Carex turgescens +
Fruiting spring–early summer.  +
Carex typhina +
Fruiting summer.  +
Carex umbellata +
Fruiting mid Mar–mid Jul.  +
Carex unilateralis +
Fruiting late spring–summer.  +
Carex ursina +
Fruiting Jul–Aug.  +
Carex utriculata +
Fruiting Jun–Aug.  +
Carex vacillans +
Fruiting Jun–Aug.  +
Carex vaginata +
Fruiting early–mid summer.  +
Carex vallicola +
Fruiting spring–early summer.  +
Carex venusta +
Fruiting late spring–early summer.  +
Carex vernacula +
Fruiting Jul–Sep.  +
Carex verrucosa +
Fruiting Jun–Jul.  +
Carex vesicaria +
Fruiting May–Aug.  +
Carex vestita +
Fruiting May–Jun.  +
Carex vexans +
Fruiting early summer.  +
Carex virescens +
Fruiting late spring–early summer.  +
Carex viridula subsp. oedocarpa +
Fruiting Jul–Aug.  +
Carex viridula var. elatior +
Fruiting Jul–Aug.  +
Carex viridula var. saxilittoralis +
Fruiting Jul–Aug.  +
Carex viridula var. viridula +
Fruiting Jun–Sep.  +
Carex vulpinoidea +
Fruiting Jul–Aug.  +
Carex whitneyi +
Fruiting summer.  +
Carex wiegandii +
Fruiting late spring–early summer.  +
Carex willdenowii +
Fruiting spring–summer (late Apr–late Jul).  +
Carex williamsii +
Fruiting summer.  +
Carex woodii +
Fruiting early summer.  +
Carex wootonii +
Fruiting late summer–fall.  +
Carex xerantica +
Fruiting late spring–early summer.  +
Carica papaya +
Flowering and fruiting year round.  +
Carissa macrocarpa +
Flowering spring–fall  +, fruiting summer–fall.  +
Carlina vulgaris subsp. vulgaris +
Flowering Jul–Sep.  +
Carlquistia muirii +
Flowering Jun–Oct.  +
Carminatia tenuiflora +
Flowering Aug–Oct.  +
Carnegiea gigantea +
Flowering early May-late Jun.  +
Carpenteria californica +
Flowering Apr–Jun.  +
Carphephorus bellidifolius +
Flowering Jul–Oct.  +
Carphephorus carnosus +
Flowering (Jun–)Jul–Oct(–Nov).  +
Carphephorus corymbosus +
Flowering (Jul–)Aug–Nov.  +
Carphephorus odoratissimus var. odoratissimus +
Flowering (Aug–)Sep–Oct(–Nov).  +
Carphephorus odoratissimus var. subtropicanus +
Flowering (Sep–)Oct–Nov.  +
Carphephorus paniculatus +
Flowering (Aug–)Sep–Dec(–Jan).  +
Carphephorus pseudoliatris +
Flowering (Jul–)Aug–Oct.  +
Carphephorus tomentosus +
Flowering Aug–Oct.  +
Carphochaete bigelovii +
Flowering Jan–Jun.  +
Carpinus caroliniana subsp. caroliniana +
Flowering late spring.  +
Carpinus caroliniana subsp. virginiana +
Flowering late spring.  +
Carpobrotus chilensis +
Flowering year-round, mostly early spring–summer.  +
Carpobrotus edulis +
Flowering year-round, mostly spring.  +
Carrichtera annua +
Flowering Apr–May.  +
Carsonia sparsifolia +
Flowering spring–summer.  +
Carthamus creticus +
Flowering summer (Jun–Aug).  +
Carthamus lanatus +
Flowering Apr–Sep(–Nov).  +
Carthamus leucocaulos +
Flowering summer (Jun–Aug).  +
Carthamus tinctorius +
Flowering late spring–summer (May–Aug).  +
Carya aquatica +
Flowering spring.  +
Carya cordiformis +
Flowering spring.  +
Carya floridana +
Flowering spring.  +
Carya glabra +
Flowering spring.  +
Carya illinoinensis +
Flowering spring.  +
Carya laciniosa +
Flowering spring.  +
Carya myristiciformis +
Flowering spring.  +
Carya ovata var. australis +
Flowering spring.  +
Carya ovata var. ovata +
Flowering spring.  +
Carya pallida +
Flowering spring.  +
Carya texana +
Flowering spring.  +
Carya tomentosa +
Flowering spring.  +
Caryota mitis +
Flowering summer.  +
Caryota urens +
Flowering in summer.  +
Cascadia nuttallii +
Flowering spring–summer.  +
Cassiope lycopodioides +
Flowering Jun–Aug.  +
Cassiope mertensiana subsp. californica +
Flowering Jun–Sep.  +
Cassiope mertensiana subsp. ciliolata +
Flowering Jul–Aug.  +
Cassiope mertensiana subsp. gracilis +
Flowering Jul–Aug.  +
Cassiope mertensiana subsp. mertensiana +
Flowering Jun–Jul.  +
Cassiope tetragona subsp. saximontana +
Flowering Jun–Aug.  +
Cassiope tetragona subsp. tetragona +
Flowering Jun–Aug.  +
Cassytha filiformis +
Flowering spring–summer (May–Jul).  +
Castanea dentata +
Flowering summer (Jun–Jul).  +
Castanea ozarkensis +
Flowering June.  +
Castanea pumila +
Flowering spring (May–Jun).  +
Castilleja affinis var. affinis +
Flowering Feb–Aug(–Oct).  +
Castilleja affinis var. contentiosa +
Flowering Feb–Aug(–Sep).  +
Castilleja affinis var. neglecta +
Flowering Mar–Jul.  +
Castilleja ambigua var. ambigua +
Flowering Apr–Aug(–Oct).  +
Castilleja ambigua var. humboldtiensis +
Flowering Apr–Jul(–Aug).  +
Castilleja ambigua var. insalutata +
Flowering Apr–Jul(–Aug).  +
Castilleja ambigua var. meadii +
Flowering Apr–Jun(–Jul).  +
Castilleja angustifolia var. angustifolia +
Flowering (Apr–)May–Jul.  +
Castilleja angustifolia var. dubia +
Flowering Jun.  +
Castilleja angustifolia var. flavescens +
Flowering (Mar–)Apr–Jul.  +
Castilleja applegatei var. applegatei +
Flowering Jun–Aug.  +
Castilleja applegatei var. breweri +
Flowering Jun–Aug(–Sep).  +
Castilleja applegatei var. pinetorum +
Flowering (Apr–)May–Aug.  +
Castilleja applegatei var. viscida +
Flowering May–Aug.  +
Castilleja aquariensis +
Flowering Jun–Aug.  +
Castilleja arachnoidea +
Flowering (May–)Jun–Aug(–Sep).  +
Castilleja attenuata +
Flowering (Feb–)Mar–Jun.  +
Castilleja brevilobata +
Flowering Mar–Aug.  +
Castilleja brevistyla +
Flowering Mar–Jun.  +
Castilleja campestris var. campestris +
Flowering (Mar–)Apr–Jul(–Aug).  +
Castilleja campestris var. succulenta +
Flowering Apr–May.  +
Castilleja cervina +
Flowering (May–)Jun–Jul.  +
Castilleja chambersii +
Flowering Jun–Aug.  +
Castilleja chlorotica +
Flowering Jun–Aug.  +
Castilleja christii +
Flowering Jun–Jul.  +
Castilleja chromosa +
Flowering (Feb–)Mar–Aug(–Nov).  +
Castilleja chrymactis +
Flowering (Jan–)Feb–Sep(–Oct).  +
Castilleja chrysantha +
Flowering May–Oct.  +
Castilleja cinerea +
Flowering May–Aug(–Oct).  +
Castilleja citrina +
Flowering (Mar–)Apr–May.  +
Castilleja coccinea +
Flowering Jan–Sep.  +
Castilleja collegiorum +
Flowering late Jun–Jul.  +
Castilleja covilleana +
Flowering Jun–Aug.  +
Castilleja crista-galli +
Flowering Jun–Aug.  +
Castilleja cryptantha +
Flowering Jul–Aug.  +
Castilleja cusickii +
Flowering Apr–Aug.  +
Castilleja densiflora var. densiflora +
Flowering Mar–May.  +
Castilleja densiflora var. gracilis +
Flowering Mar–May(–Jun).  +
Castilleja densiflora var. obispoënsis +
Flowering Apr–May.  +
Castilleja dissitiflora +
Flowering Jun–Aug.  +
Castilleja disticha +
Flowering (May–)Jun–Aug(–Sep).  +
Castilleja elata +
Flowering May–Aug.  +
Castilleja elegans +
Flowering Jun–Aug.  +
Castilleja elmeri +
Flowering May–Aug.  +
Castilleja exserta var. exserta +
Flowering Jan–Jun(–Aug).  +
Castilleja exserta var. latifolia +
Flowering (Mar–)Apr–Aug.  +
Castilleja exserta var. venusta +
Flowering (Mar–)Apr–May(–Jul).  +
Castilleja flava var. flava +
Flowering Jun–Aug(–Sep).  +
Castilleja flava var. rustica +
Flowering Jun–Aug.  +
Castilleja foliolosa +
Flowering Jan–Jul.  +
Castilleja fraterna +
Flowering Jul–Aug(–Sep).  +
Castilleja genevieveana +
Flowering Mar–Jun.  +
Castilleja glandulifera +
Flowering Jun–Aug.  +
Castilleja gleasoni +
Flowering May–Jun.  +
Castilleja gracillima +
Flowering May–Aug.  +
Castilleja grisea +
Flowering Feb–Jun.  +
Castilleja haydenii +
Flowering Jul–Sep.  +
Castilleja hispida var. acuta +
Flowering (Mar–)Apr–Sep.  +
Castilleja hispida var. hispida +
Flowering (Mar–)Apr–Aug.  +
Castilleja hololeuca +
Flowering Mar–Oct.  +
Castilleja hyperborea +
Flowering May–Aug(–Sep).  +
Castilleja indivisa +
Flowering Jan–Jun(–Dec).  +
Castilleja integra +
Flowering (Jan–)Mar–Oct.  +
Castilleja kaibabensis +
Flowering Jul–Sep.  +
Castilleja kerryana +
Flowering Jul–Aug(–Sep).  +
Castilleja kraliana +
Flowering (Mar–)Apr–Jun(–Jul).  +
Castilleja lacera +
Flowering (Mar–)Apr–Jul(–Aug).  +
Castilleja lanata +
Flowering year-round.  +
Castilleja lasiorhyncha +
Flowering Jun–Jul.  +
Castilleja lassenensis +
Flowering Jul–Sep.  +
Castilleja latifolia +
Flowering Feb–Oct.  +
Castilleja lemmonii +
Flowering Jun–Aug.  +
Castilleja leschkeana +
Flowering Jun.  +
Castilleja levisecta +
Flowering Apr–Jul(–Sep).  +
Castilleja linariifolia +
Flowering Apr–Oct.  +
Castilleja lindheimeri +
Flowering Jan–May.  +
Castilleja lineariloba +
Flowering Apr–Jun(–Jul).  +
Castilleja lineata +
Flowering Jun–Aug.  +
Castilleja litoralis +
Flowering (Apr–)May–Aug(–Sep).  +
Castilleja lutescens +
Flowering May–Aug.  +
Castilleja martini var. clokeyi +
Flowering Jun–Aug.  +
Castilleja martini var. martini +
Flowering Mar–Sep.  +
Castilleja mendocinensis +
Flowering Apr–Aug.  +
Castilleja mexicana +
Flowering Feb–Oct.  +
Castilleja miniata var. dixonii +
Flowering May–Sep.  +
Castilleja miniata var. fulva +
Flowering Jun–Aug.  +
Castilleja miniata var. miniata +
Flowering Mar–Sep(–Oct).  +
Castilleja miniata var. oblongifolia +
Flowering Jul–Sep(–Oct).  +
Castilleja minor var. exilis +
Flowering Apr–Oct(–Nov).  +
Castilleja minor var. minor +
Flowering Apr–Sep.  +
Castilleja minor var. spiralis +
Flowering Jun–Aug.  +
Castilleja minor var. stenantha +
Flowering Feb–Sep.  +
Castilleja mogollonica +
Flowering Jun–Sep.  +
Castilleja mollis +
Flowering Apr–Aug.  +
Castilleja montigena +
Flowering May–Aug.  +
Castilleja nana +
Flowering Jun–Aug.  +
Castilleja nelsonii +
Flowering Jun–Oct.  +
Castilleja nervata +
Flowering Aug–Sep.  +
Castilleja nivea +
Flowering Jun–Aug.  +
Castilleja occidentalis +
Flowering Jun–Sep.  +
Castilleja oresbia +
Flowering May–Aug.  +
Castilleja organorum +
Flowering Jun–Oct.  +
Castilleja ornata +
Flowering Jul–Sep.  +
Castilleja pallescens var. inverta +
Flowering May–Aug.  +
Castilleja pallescens var. pallescens +
Flowering Jun–Aug.  +
Castilleja pallida var. caudata +
Flowering Jun–Aug(–Sep).  +
Castilleja pallida var. yukonis +
Flowering Jun–Aug.  +
Castilleja parviflora var. albida +
Flowering (Jun–)Jul–Sep.  +
Castilleja parviflora var. olympica +
Flowering Jul–Sep.  +
Castilleja parviflora var. oreopola +
Flowering Jun–Sep.  +
Castilleja parviflora var. parviflora +
Flowering Jun–Sep.  +
Castilleja parvula +
Flowering Jun–Aug.  +
Castilleja patriotica +
Flowering Jul–Oct.  +
Castilleja peckiana +
Flowering (Apr–)May–Aug.  +
Castilleja peirsonii +
Flowering Jun–Sep.  +
Castilleja pilosa var. longispica +
Flowering Jun–Aug.  +
Castilleja pilosa var. pilosa +
Flowering May–Aug.  +
Castilleja pilosa var. steenensis +
Flowering May–Aug.  +
Castilleja plagiotoma +
Flowering Mar–Jul.  +
Castilleja praeterita +
Flowering Jun–Aug.  +
Castilleja pruinosa +
Flowering Mar–Aug.  +
Castilleja puberula +
Flowering (Feb–)Jul–Aug.  +
Castilleja pulchella +
Flowering (May–)Jun–Aug.  +
Castilleja purpurascens +
Flowering (May–)Jun–Jul.  +
Castilleja purpurea +
Flowering Mar–May.  +
Castilleja raupii +
Flowering Jun–Aug.  +
Castilleja revealii +
Flowering May–Jul.  +
Castilleja rhexiifolia +
Flowering (Mar–)May–Sep.  +
Castilleja rigida +
Flowering Mar–Jul(–Nov).  +
Castilleja rubicundula var. lithospermoides +
Flowering Apr–Jun(–Jul).  +
Castilleja rubicundula var. rubicundula +
Flowering (Apr–)May–Jun(–Jul).  +
Castilleja rubida +
Flowering Jul–Aug.  +
Castilleja rupicola +
Flowering (May–)Jun–Sep.  +
Castilleja salsuginosa +
Flowering Jun–Jul.  +
Castilleja scabrida var. barnebyana +
Flowering May–Jul.  +
Castilleja scabrida var. scabrida +
Flowering Mar–Sep.  +
Castilleja schizotricha +
Flowering Jul–Aug.  +
Castilleja septentrionalis +
Flowering (Apr–)May–Sep.  +
Castilleja sessiliflora +
Flowering (Feb–)Mar–Aug(–Oct).  +
Castilleja subinclusa var. franciscana +
Flowering Mar–Jul.  +
Castilleja subinclusa var. jepsonii +
Flowering Mar–Jul.  +
Castilleja subinclusa var. subinclusa +
Flowering Apr–Jul.  +
Castilleja suksdorfii +
Flowering Jun–Sep.  +
Castilleja tenuiflora var. tenuiflora +
Flowering Mar–Nov(–Dec).  +
Castilleja tenuis +
Flowering Feb–Sep.  +
Castilleja thompsonii +
Flowering Apr–Aug(–Sep).  +
Castilleja tomentosa +
Flowering Jun–Oct.  +
Castilleja uliginosa +
Flowering May–Jun.  +
Castilleja unalaschcensis +
Flowering May–Sep.  +
Castilleja victoriae +
Flowering (Apr–)May–Jul.  +
Castilleja viscidula +
Flowering Jun–Aug.  +
Castilleja wightii +
Flowering Mar–Aug(–Nov).  +
Castilleja wootonii +
Flowering Jun–Sep.  +
Castilleja xanthotricha +
Flowering Apr–Jul.  +
Casuarina cunninghamiana subsp. cunninghamiana +
Flowering summer.  +
Casuarina equisetifolia subsp. equisetifolia +
Flowering spring–summer.  +
Catharanthus roseus +
Flowering spring–fall  +, fruiting summer–fall.  +
Catopsis berteroniana +
Flowering fall–winter.  +
Catopsis floribunda +
Flowering fall–winter.  +
Catopsis nutans +
Flowering fall–winter.  +
Catoscopium nigritum +
Capsules mature summer.  +
Caulanthus amplexicaulis +
Flowering Apr–Jul(-Aug).  +
Caulanthus anceps +
Flowering Mar–May.  +
Caulanthus barnebyi +
Flowering May–Jun.  +
Caulanthus californicus +
Flowering Feb–Apr.  +
Caulanthus cooperi +
Flowering (Jan-)Feb–Mar.  +
Caulanthus coulteri +
Flowering Mar–Jun(-Jul).  +
Caulanthus crassicaulis +
Flowering Apr–Jul.  +
Caulanthus flavescens +
Flowering Mar–May.  +
Caulanthus glaucus +
Flowering Apr–Jun.  +
Caulanthus hallii +
Flowering Mar–May.  +
Caulanthus heterophyllus +
Flowering Mar–May.  +
Caulanthus inflatus +
Flowering Feb–Jun.  +
Caulanthus lasiophyllus +
Flowering Mar–May.  +
Caulanthus lemmonii +
Flowering (Feb-)Mar–May.  +
Caulanthus major +
Flowering May–Aug.  +
Caulanthus pilosus +
Flowering late Mar-early Jul.  +
Caulanthus simulans +
Flowering Mar–Jun.  +
Caulophyllum giganteum +
Flowering early spring.  +
Caulophyllum thalictroides +
Flowering late spring.  +
Causonis japonica +
Flowering late May–Jun  +, fruiting Aug–Sep.  +
Cayaponia americana +
Flowering May–Aug.  +
Cayaponia quinqueloba +
Flowering Jun–Oct(–Nov).  +
Ceanothus americanus +
Flowering May–Aug.  +
Ceanothus arboreus +
Flowering Feb–May.  +
Ceanothus arcuatus +
Flowering May–Jun.  +
Ceanothus confusus +
Flowering Feb–May.  +
Ceanothus cordulatus +
Flowering May–Jul.  +
Ceanothus crassifolius var. crassifolius +
Flowering Jan–Apr.  +
Ceanothus crassifolius var. planus +
Flowering Jan–Apr.  +
Ceanothus cuneatus var. cuneatus +
Flowering Jan–May.  +
Ceanothus cuneatus var. fascicularis +
Flowering Feb–Apr.  +
Ceanothus cuneatus var. ramulosus +
Flowering Feb–May.  +
Ceanothus cuneatus var. rigidus +
Flowering Feb–Apr.  +
Ceanothus cyaneus +
Flowering Apr–Jun.  +
Ceanothus dentatus +
Flowering Mar–Jun.  +
Ceanothus divergens +
Flowering Feb–Apr.  +
Ceanothus diversifolius +
Flowering Apr–Jun.  +
Ceanothus fendleri +
Flowering Jan–Jul.  +
Ceanothus ferrisiae +
Flowering Jan–May.  +
Ceanothus foliosus var. foliosus +
Flowering Jan–May.  +
Ceanothus foliosus var. medius +
Flowering Feb–May.  +
Ceanothus foliosus var. vineatus +
Flowering Mar–May.  +
Ceanothus fresnensis +
Flowering May–Jun.  +
Ceanothus gloriosus var. exaltatus +
Flowering Mar–Jun.  +
Ceanothus gloriosus var. gloriosus +
Flowering Mar–May.  +
Ceanothus gloriosus var. porrectus +
Flowering Mar–May.  +
Ceanothus griseus +
Flowering Mar–Jun.  +
Ceanothus hearstiorum +
Flowering Mar–Apr.  +
Ceanothus herbaceus +
Flowering Mar–Aug.  +
Ceanothus impressus var. impressus +
Flowering Feb–Apr.  +
Ceanothus impressus var. nipomensis +
Flowering Feb–May.  +
Ceanothus incanus +
Flowering Apr–Jun.  +
Ceanothus integerrimus +
Flowering May–Jul.  +
Ceanothus jepsonii var. albiflorus +
Flowering Feb–Apr.  +
Ceanothus jepsonii var. jepsonii +
Flowering Feb–Apr.  +
Ceanothus lemmonii +
Flowering Apr–May.  +
Ceanothus leucodermis +
Flowering Apr–Jun.  +
Ceanothus maritimus +
Flowering Feb–May.  +
Ceanothus martini +
Flowering May–Jul.  +
Ceanothus masonii +
Flowering Feb–Apr.  +
Ceanothus megacarpus var. insularis +
Flowering Feb–Apr.  +
Ceanothus megacarpus var. megacarpus +
Flowering Nov–Apr.  +
Ceanothus microphyllus +
Flowering Mar–Jun.  +
Ceanothus oliganthus var. oliganthus +
Flowering Mar–Jun.  +
Ceanothus oliganthus var. orcuttii +
Flowering Feb–Jun.  +
Ceanothus oliganthus var. sorediatus +
Flowering Feb–Jun.  +
Ceanothus ophiochilus +
Flowering Mar–Apr.  +
Ceanothus otayensis +
Flowering Jan–Apr.  +
Ceanothus palmeri +
Flowering Mar–Jun.  +
Ceanothus papillosus +
Flowering Mar–May.  +
Ceanothus parryi +
Flowering Apr–May.  +
Ceanothus parvifolius +
Flowering May–Jul.  +
Ceanothus pauciflorus +
Flowering Feb–May.  +
Ceanothus perplexans +
Flowering Jan–Apr.  +
Ceanothus pinetorum +
Flowering May–Jun.  +
Ceanothus prostratus var. occidentalis +
Flowering Apr–May.  +
Ceanothus prostratus var. prostratus +
Flowering Apr–Jun.  +
Ceanothus pumilus +
Flowering Apr–Jun.  +
Ceanothus purpureus +
Flowering Feb–Apr.  +
Ceanothus roderickii +
Flowering Apr–Jun.  +
Ceanothus sanguineus +
Flowering Apr–Jul.  +
Ceanothus sonomensis +
Flowering Mar–Apr.  +
Ceanothus spinosus +
Flowering Jan–May.  +
Ceanothus thyrsiflorus +
Flowering Mar–Jun.  +
Ceanothus tomentosus var. olivaceus +
Flowering Feb–May.  +
Ceanothus tomentosus var. tomentosus +
Flowering Mar–May.  +
Ceanothus velutinus var. laevigatus +
Flowering Mar–Jun.  +
Ceanothus velutinus var. velutinus +
Flowering May–Aug.  +
Ceanothus verrucosus +
Flowering Jan–Apr.  +
Celastrus orbiculatus +
Flowering spring–summer.  +
Celastrus scandens +
Flowering spring–summer.  +
Celosia argentea +
Flowering summer.  +
Celosia cristata +
Flowering late summer–fall.  +
Celosia nitida +
Flowering fall–winter.  +
Celosia palmeri +
Flowering summer–winter.  +
Celosia trigyna +
Flowering winter.  +
Celtis laevigata +
Flowering late spring–early fall (May–Oct).  +
Celtis lindheimeri +
Flowering late winter–spring (Mar–May).  +
Celtis occidentalis +
Flowering late winter–spring (Mar–May).  +
Celtis pallida +
Flowering late winter–spring (Mar–May).  +
Celtis reticulata +
Flowering late winter–spring.  +
Celtis tenuifolia +
Flowers spring (Apr–May).  +
Centaurea benedicta +
Flowering spring–summer (Apr–Aug).  +
Centaurea calcitrapa +
Flowering summer–autumn (Jun–Nov).  +
Centaurea cyanus +
Flowering spring–summer (May–Sep).  +
Centaurea depressa +
Flowering spring–summer (May–Jul).  +
Centaurea diffusa +
Flowering summer (Jun–Aug).  +
Centaurea diluta +
Flowering spring (Apr–Jun).  +
Centaurea iberica +
Flowering summer (Jun–Sep).  +
Centaurea jacea +
Flowering summer–fall (Jun–Oct).  +
Centaurea macrocephala +
Flowering summer (Jun–Sep).  +
Centaurea melitensis +
Flowering mostly spring–summer (Apr–Jul).  +
Centaurea montana +
Flowering summer (Jun–Aug).  +
Centaurea nigra +
Flowering summer–fall (Jun–Oct).  +
Centaurea nigrescens +
Flowering summer–fall (Jun–Oct).  +
Centaurea phrygia +
Flowering summer (Jul–Sep).  +
Centaurea scabiosa +
Flowering summer (Jun–Sep).  +
Centaurea solstitialis +
Flowering mostly summer–autumn (Jun–Oct), sometimes year-round in frostfree coastal habitats.  +
Centaurea stoebe subsp. micranthos +
Flowering summer (Jun–Sep).  +
Centaurea sulphurea +
Flowering spring–summer (May–Jul).  +
Centaurea virgata subsp. squarrosa +
Flowering summer (Jun–Sep).  +
Centaurea ×moncktonii +
Flowering spring–fall (May–Nov).  +
Centaurium erythraea +
Flowering summer–early fall.  +
Centaurium pulchellum +
Flowering spring (southward)–fall.  +
Centaurium tenuiflorum +
Flowering summer–fall.  +
Centratherum punctatum +
Flowering year-round.  +
Centromadia fitchii +
Flowering May–Nov.  +
Centromadia parryi subsp. australis +
Flowering Jun–Oct.  +
Centromadia parryi subsp. congdonii +
Flowering Jun–Oct.  +
Centromadia parryi subsp. parryi +
Flowering Jun–Oct.  +
Centromadia parryi subsp. rudis +
Flowering Jun–Oct.  +
Centromadia pungens subsp. laevis +
Flowering Apr–Sep.  +
Centromadia pungens subsp. pungens +
Flowering Apr–Nov.  +
Centrostegia thurberi +
Flowering Mar–Jul.  +
Cephalanthera austiniae +
Flowering summer.  +
Cerastium aleuticum +
Flowering summer.  +
Cerastium alpinum subsp. alpinum +
Flowering spring.  +
Cerastium alpinum subsp. lanatum +
Flowering spring.  +
Cerastium arcticum +
Flowering summer.  +
Cerastium arvense subsp. arvense +
Flowering spring.  +
Cerastium arvense subsp. strictum +
Flowering spring.  +
Cerastium axillare +
Flowering summer.  +
Cerastium beeringianum +
Flowering spring and early summer.  +
Cerastium bialynickii +
Flowering summer.  +
Cerastium brachypetalum +
Flowering spring.  +
Cerastium brachypodum +
Flowering spring and early summer.  +
Cerastium cerastoides +
Flowering summer.  +
Cerastium dichotomum +
Flowering spring–early summer.  +
Cerastium diffusum +
Flowering spring.  +
Cerastium dubium +
Flowering spring.  +
Cerastium fastigiatum +
Flowering summer.  +
Cerastium fischerianum +
Flowering summer.  +
Cerastium fontanum subsp. fontanum +
Flowering summer.  +
Cerastium fontanum subsp. vulgare +
Flowering throughout growing season.  +
Cerastium glomeratum +
Flowering throughout growing season.  +
Cerastium maximum +
Flowering summer.  +
Cerastium nutans var. nutans +
Flowering throughout growing season.  +
Cerastium nutans var. obtectum +
Flowering summer.  +
Cerastium pumilum +
Flowering spring.  +
Cerastium regelii +
Flowering summer.  +
Cerastium semidecandrum +
Flowering spring.  +
Cerastium terrae-novae +
Flowering summer.  +
Cerastium texanum +
Flowering spring.  +
Cerastium tomentosum +
Flowering spring.  +
Cerastium velutinum var. velutinum +
Flowering spring.  +
Cerastium velutinum var. villossissimum +
Flowering spring.  +
Cerastium viride +
Flowering spring–early summer.  +
Ceratiola ericoides +
Flowering Mar–Jun(-Nov).  +
Ceratodon heterophyllus +
Capsules mature early summer–late fall.  +
Ceratodon purpureus subsp. conicus +
Capsules mature early summer–late fall.  +
Ceratodon purpureus subsp. purpureus +
Capsules mature early summer–late fall.  +
Ceratodon purpureus subsp. stenocarpus +
Capsules mature early summer–late fall.  +
Ceratophyllum demersum +
Flowering spring–late fall.  +
Ceratophyllum echinatum +
Flowering spring–summer.  +
Ceratophyllum muricatum subsp. australe +
Flowering spring.  +
Ceratotheca triloba +
Flowering Jul–Nov.  +
Cercocarpus betuloides var. betuloides +
Flowering Mar–May.  +
Cercocarpus betuloides var. blancheae +
Flowering late Feb–Apr.  +
Cercocarpus betuloides var. traskiae +
Flowering Mar–Apr.  +
Cercocarpus breviflorus +
Flowering late Jun–Aug(–Sep).  +
Cercocarpus ledifolius var. intermontanus +
Flowering May–Jun.  +
Cercocarpus ledifolius var. intricatus +
Flowering late Mar–early Jun.  +
Cercocarpus ledifolius var. ledifolius +
Flowering Apr–May.  +
Cercocarpus montanus +
Flowering May–Jun.  +
Cestrum diurnum +
Flowering late spring–mid-summer.  +
Cestrum nocturnum +
Flowering mid-summer–winter.  +
Cestrum parqui +
Flowering mid-summer–winter.  +
Cevallia sinuata +
Flowering Apr–Oct.  +
Chaenactis alpigena +
Flowering Jul–Sep.  +
Chaenactis artemisiifolia +
Flowering Apr–early Jul.  +
Chaenactis carphoclinia var. carphoclinia +
Flowering Jan–Jun.  +
Chaenactis carphoclinia var. peirsonii +
Flowering Mar–Apr.  +
Chaenactis cusickii +
Flowering late Apr–Jun.  +
Chaenactis douglasii var. alpina +
Flowering Jul–Sep.  +
Chaenactis douglasii var. douglasii +
Flowering May–Sep.  +
Chaenactis evermannii +
Flowering Jun–Aug.  +
Chaenactis fremontii +
Flowering Mar–May.  +
Chaenactis glabriuscula var. glabriuscula +
Flowering Feb–Jun.  +
Chaenactis glabriuscula var. heterocarpha +
Flowering Mar–Jun.  +
Chaenactis glabriuscula var. lanosa +
Flowering Mar–June.  +
Chaenactis glabriuscula var. megacephala +
Flowering Mar–Jun.  +
Chaenactis glabriuscula var. orcuttiana +
Flowering late Apr–Jun.  +
Chaenactis macrantha +
Flowering Mar–early Jul.  +
Chaenactis nevadensis +
Flowering Jul–mid Sep.  +
Chaenactis nevii +
Flowering late Apr–mid July.  +
Chaenactis parishii +
Flowering May–Jul.  +
Chaenactis santolinoides +
Flowering (Mar–)May–Jul.  +
Chaenactis stevioides +
Flowering Feb–Jun.  +
Chaenactis suffrutescens +
Flowering May–early Sep.  +
Chaenactis thompsonii +
Flowering Jun–Aug.  +
Chaenactis xantiana +
Flowering late Mar–Jul.  +
Chaenomeles japonica +
Flowering Apr–May  +, fruiting Aug–Oct.  +
Chaenomeles speciosa +
Flowering Apr–May  +, fruiting Aug–Oct.  +
Chaenorhinum minus subsp. minus +
Flowering May–Oct.  +
Chaetadelpha wheeleri +
Flowering May–Jul.  +
Chaetopappa asteroides var. asteroides +
Flowering Mar–Jul(–Nov).  +
Chaetopappa asteroides var. grandis +
Flowering Mar–May.  +
Chaetopappa bellidifolia +
Flowering late Mar–Jul.  +
Chaetopappa bellioides +
Flowering May(–Sep, –Nov).  +
Chaetopappa effusa +
Flowering (May–)Jul–Oct.  +
Chaetopappa ericoides +
Flowering (Mar–)Apr–Aug(–Nov).  +
Chaetopappa hersheyi +
Flowering May–Aug.  +
Chaetopappa imberbis +
Flowering (Feb–)Mar–May(–Jun).  +
Chaetopappa parryi +
Flowering May–Sep(–Oct).  +
Chamaebatia australis +
Flowering Apr–Jun.  +
Chamaebatia foliolosa +
Flowering Apr–Jun.  +
Chamaebatiaria millefolium +
Flowering Jul–Sep.  +
Chamaechaenactis scaposa +
Flowering late Apr–early Jul.  +
Chamaedaphne calyculata +
Flowering Apr–Jul  +, fruiting Jul–Aug.  +
Chamaedorea seifrizii +
Flowering summer.  +
Chamaelirium luteum +
Flowering late spring–summer.  +
Chamaemelum fuscatum +
Flowering Mar–Apr.  +
Chamaemelum nobile +
Flowering Jul–Aug.  +
Chamaenerion angustifolium subsp. angustifolium +
Flowering Jun–Sep.  +
Chamaenerion angustifolium subsp. circumvagum +
Flowering Jun–Sep.  +
Chamaenerion latifolium +
Flowering Jun–Aug(–Sep).  +
Chamaerhodos erecta +
Flowering Jun–Aug  +, fruiting Jul–Sep.  +
Chamaesaracha coniodes +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha coronopus +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha crenata +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha darcyi +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha edwardsiana +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha pallida +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha sordida +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamaesaracha villosa +
Flowering Mar–Oct (mostly late spring–early summer, depending on rain).  +
Chamelaucium uncinatum +
Flowering spring.  +
Chaptalia albicans +
Flowering (Mar–)Apr–Jul(–Nov).  +
Chaptalia texana +
Flowering Mar–Jun.  +
Chaptalia tomentosa +
Flowering Dec–Apr(–May in North Carolina).  +
Chasmanthe floribunda +
Flowering mostly Feb–May.  +
Cheilanthes aemula +
Sporulating summer–fall.  +
Cheilanthes alabamensis +
Sporulating summer–fall.  +
Cheilanthes arizonica +
Sporulating summer–fall.  +
Cheilanthes bonariensis +
Sporulating summer–fall.  +
Cheilanthes clevelandii +
Sporulating late spring–summer.  +
Cheilanthes cooperae +
Sporulating late spring–summer.  +
Cheilanthes covillei +
Sporulating late spring–fall.  +
Cheilanthes eatonii +
Sporulating summer–fall.  +
Cheilanthes feei +
Sporulating late spring–fall.  +
Cheilanthes fendleri +
Sporulating summer–fall.  +
Cheilanthes gracillima +
Sporulating summer–fall.  +
Cheilanthes horridula +
Sporulating summer–fall.  +
Cheilanthes intertexta +
Sporulating late spring–fall.  +
Cheilanthes kaulfussii +
Sporulating summer–fall.  +
Cheilanthes lanosa +
Sporulating summer–fall.  +
Cheilanthes lendigera +
Sporulating summer–fall.  +
Cheilanthes leucopoda +
Sporulating summer–fall.  +
Cheilanthes lindheimeri +
Sporulating summer–fall.  +
Cheilanthes microphylla +
Sporulating summer–fall.  +
Cheilanthes newberryi +
Sporulating late spring–summer.  +
Cheilanthes parryi +
Sporulating late spring–fall.  +
Cheilanthes pringlei +
Sporulating late spring–fall.  +
Cheilanthes tomentosa +
Sporulating summer–fall.  +
Cheilanthes villosa +
Sporulating summer–fall.  +
Cheilanthes viscida +
Sporulating late spring–fall.  +
Cheilanthes wootonii +
Sporulating summer–fall.  +
Cheilanthes wrightii +
Sporulating summer–fall.  +
Cheilanthes yavapensis +
Sporulating summer–fall.  +
Chelidonium majus +
Flowering spring–summer.  +
Chelone cuthbertii +
Flowering Jul–Oct.  +
Chelone glabra +
Flowering Jul–Nov.  +
Chelone lyonii +
Flowering Jun–Oct.  +
Chelone obliqua var. erwiniae +
Flowering Jul–Oct.  +
Chelone obliqua var. obliqua +
Flowering Jul–Oct.  +
Chelone obliqua var. speciosa +
Flowering Jul–Oct.  +
Chenopodium albescens +
Fruiting early summer.  +
Chenopodium album +
Fruiting late summer–fall.  +
Chenopodium atrovirens +
Fruiting mid summer–fall.  +
Chenopodium berlandieri var. berlandieri +
Fruiting summer–fall.  +
Chenopodium berlandieri var. boscianum +
Fruiting Aug–Sep.  +
Chenopodium berlandieri var. bushianum +
Fruiting Sep–Oct.  +
Chenopodium berlandieri var. macrocalycium +
Fruiting Sep.  +
Chenopodium berlandieri var. sinuatum +
Fruiting Aug–Sep.  +
Chenopodium berlandieri var. zschackei +
Fruiting fall.  +
Chenopodium bonus-henricus +
Fruiting early summer–fall.  +
Chenopodium californicum +
Fruiting spring–fall (winter).  +
Chenopodium capitatum var. capitatum +
Fruiting summer–fall.  +
Chenopodium capitatum var. parvicapitatum +
Fruiting summer–fall.  +
Chenopodium chenopodioides +
Fruiting summer–fall.  +
Chenopodium cycloides +
Fruiting early summer–fall.  +
Chenopodium desiccatum +
Fruiting mid summer–fall.  +
Chenopodium ficifolium +
Fruiting early summer–fall.  +
Chenopodium foggii +
Fruiting late summer.  +
Chenopodium foliosum +
Fruiting summer–fall.  +
Chenopodium fremontii +
Fruiting late summer–fall.  +
Chenopodium glaucum var. glaucum +
Fruiting late summer–fall.  +
Chenopodium glaucum var. salinum +
Fruiting late summer–fall.  +
Chenopodium hians +
Fruiting late summer–early fall.  +
Chenopodium incanum var. elatum +
Fruiting late Jun-late Sep.  +
Chenopodium incanum var. incanum +
Fruiting summer.  +
Chenopodium incanum var. occidentale +
Fruiting late spring–early fall.  +
Chenopodium leptophyllum +
Fruiting mid summer–early fall.  +
Chenopodium macrospermum +
Fruiting Jun–Sep.  +
Chenopodium murale +
Fruiting fall.  +
Chenopodium neomexicanum +
Fruiting late summer–early fall.  +
Chenopodium nevadense +
Fruiting spring–fall.  +
Chenopodium opulifolium +
Fruiting late summer–fall.  +
Chenopodium pallescens +
Fruiting early–late summer.  +
Chenopodium polyspermum var. acutifolium +
Fruiting summer–fall.  +
Chenopodium polyspermum var. polyspermum +
Fruiting summer–fall.  +
Chenopodium pratericola +
Fruiting early summer–fall.  +
Chenopodium rubrum var. humile +
Fruiting fall.  +
Chenopodium rubrum var. rubrum +
Fruiting Aug–Oct.  +
Chenopodium simplex +
Fruiting Jul–Oct.  +
Chenopodium standleyanum +
Fruiting Sep.  +
Chenopodium strictum +
Fruiting fall.  +
Chenopodium subglabrum +
Fruiting mid summer–fall.  +
Chenopodium urbicum +
Fruiting late summer–fall.  +
Chenopodium vulvaria +
Fruiting fall.  +
Chenopodium watsonii +
Fruiting late summer–fall.  +
Chimaphila maculata +
Flowering May–Jul(-Aug).  +
Chimaphila menziesii +
Flowering (May-)Jun–Aug.  +
Chimaphila umbellata subsp. umbellata +
Flowering Jul–Aug.  +
Chionodoxa luciliae +
Flowering early to mid spring.  +
Chionophila jamesii +
Flowering Jun–Aug.  +
Chionophila tweedyi +
Flowering Jun–Aug.  +
Chloracantha spinosa var. spinosa +
Flowering (May–)Aug–Nov.  +
Chlorocrambe hastata +
Flowering Jun–Aug.  +
Chlorogalum angustifolium +
Flowering Apr–Jul.  +
Chlorogalum grandiflorum +
Flowering May–Jun.  +
Chlorogalum parviflorum +
Flowering May–Aug.  +
Chlorogalum pomeridianum var. divaricatum +
Flowering May–Jul.  +
Chlorogalum pomeridianum var. minus +
Flowering May–Jun.  +
Chlorogalum pomeridianum var. pomeridianum +
Flowering May–Aug.  +
Chlorogalum purpureum var. purpureum +
Flowering May–Jun.  +
Chlorogalum purpureum var. reductum +
Flowering May–Jun.  +
Chloropyron maritimum subsp. canescens +
Flowering Jun–Sep.  +
Chloropyron maritimum subsp. maritimum +
Flowering May–Oct.  +
Chloropyron maritimum subsp. palustre +
Flowering May–Oct.  +
Chloropyron molle subsp. hispidum +
Flowering Jun–Jul.  +
Chloropyron molle subsp. molle +
Flowering Jul–Nov.  +
Chloropyron palmatum +
Flowering Jun–Aug.  +
Chloropyron tecopense +
Flowering Jul–Oct.  +
Chondrilla juncea +
Flowering Jul–Oct.  +
Chorisiva nevadensis +
Flowering May–Oct.  +
Chorispora tenella +
Flowering Apr–Jul.  +
Chorizanthe angustifolia +
Flowering Apr–Jul.  +
Chorizanthe biloba var. biloba +
Flowering May–Aug.  +
Chorizanthe biloba var. immemora +
Flowering May–Sep.  +
Chorizanthe blakleyi +
Flowering May–Jul.  +
Chorizanthe brevicornu var. brevicornu +
Flowering Feb–Jul.  +
Chorizanthe brevicornu var. spathulata +
Flowering Apr–Jul.  +
Chorizanthe breweri +
Flowering Mar–Jul.  +
Chorizanthe clevelandii +
Flowering May–Sep.  +
Chorizanthe corrugata +
Flowering Feb–May.  +
Chorizanthe cuspidata var. cuspidata +
Flowering Apr–Jul.  +
Chorizanthe cuspidata var. villosa +
Flowering May–Aug.  +
Chorizanthe diffusa +
Flowering Apr–Jul.  +
Chorizanthe douglasii +
Flowering Apr–Jul.  +
Chorizanthe fimbriata var. fimbriata +
Flowering Mar–Jul.  +
Chorizanthe fimbriata var. laciniata +
Flowering Mar–Jul.  +
Chorizanthe howellii +
Flowering May–Jul.  +
Chorizanthe leptotheca +
Flowering May–Aug.  +
Chorizanthe membranacea +
Flowering Apr–Jul.  +
Chorizanthe obovata +
Flowering May–Jul.  +
Chorizanthe orcuttiana +
Flowering Mar–May.  +
Chorizanthe palmeri +
Flowering May–Aug.  +
Chorizanthe parryi var. fernandina +
Flowering Apr–Jun.  +
Chorizanthe parryi var. parryi +
Flowering May–Jun.  +
Chorizanthe polygonoides var. longispina +
Flowering Apr–Jun.  +
Chorizanthe polygonoides var. polygonoides +
Flowering Apr–Jun.  +
Chorizanthe procumbens +
Flowering Apr–Jun.  +
Chorizanthe pungens var. hartwegiana +
Flowering Apr–Jul.  +
Chorizanthe pungens var. pungens +
Flowering Apr–Jul.  +
Chorizanthe rectispina +
Flowering May–Jul.  +
Chorizanthe rigida +
Flowering Feb–Jun.  +
Chorizanthe robusta var. hartwegii +
Flowering Apr–Jul.  +
Chorizanthe robusta var. robusta +
Flowering May–Sep.  +
Chorizanthe spinosa +
Flowering Apr–Jul.  +
Chorizanthe staticoides +
Flowering Apr–Jul.  +
Chorizanthe stellulata +
Flowering Apr–Jul.  +
Chorizanthe uniaristata +
Flowering Apr–Jul.  +
Chorizanthe valida +
Flowering Jun–Aug.  +
Chorizanthe ventricosa +
Flowering May–Sep.  +
Chorizanthe watsonii +
Flowering Apr–Aug.  +
Chorizanthe wheeleri +
Flowering Apr–Jun.  +
Chorizanthe xanti var. leucotheca +
Flowering Apr–Jun.  +
Chorizanthe xanti var. xanti +
Flowering Apr–Jul.  +
Chromolaena bigelovii +
Flowering Oct–Dec.  +
Chromolaena frustrata +
Flowering mostly Aug–Nov, sometimes year round.  +
Chromolaena ivifolia +
Flowering Aug–Nov.  +
Chromolaena odorata +
Flowering mostly Oct–Dec, sometimes year round.  +
Chrysactinia mexicana +
Flowering spring–fall.  +
Chrysanthemoides monilifera +
Flowering Apr.  +
Chryso-hypnum diminutivum +
Capsules mature winter.  +
Chrysobalanus icaco subsp. icaco +
Flowering year-round.  +
Chrysogonum virginianum var. australe +
Flowering mid Mar–Apr(–May).  +
Chrysogonum virginianum var. brevistolon +
Flowering Mar–May(–early Jun).  +
Chrysogonum virginianum var. virginianum +
Flowering late Mar–Jun(–Jul, later with moisture).  +
Chrysolepis chrysophylla var. chrysophylla +
Flowering summer (Jun–Sep).  +
Chrysolepis chrysophylla var. minor +
Flowering summer (Jun–Sep).  +
Chrysolepis sempervirens +
Flowering summer (Jul–Aug).  +
Chrysoma pauciflosculosa +
Flowering (Mar–)Apr–Oct(–Dec).  +
Chrysophyllum oliviforme subsp. oliviforme +
Flowering mostly late summer (sporadic throughout year).  +
Chrysopsis delaneyi +
Flowering mid Nov–early Jan.  +
Chrysopsis floridana +
Flowering mid to late fall.  +
Chrysopsis godfreyi +
Flowering Oct–Nov.  +
Chrysopsis gossypina subsp. cruiseana +
Flowering Oct–Dec.  +
Chrysopsis gossypina subsp. gossypina +
Flowering Sep (n)–Nov (s).  +
Chrysopsis gossypina subsp. hyssopifolia +
Flowering late Sep–Dec.  +
Chrysopsis highlandsensis +
Flowering late Oct–mid Dec.  +
Chrysopsis lanuginosa +
Flowering Oct–Dec (rarely spring).  +
Chrysopsis latisquamea +
Flowering Aug–Oct (occasionally late spring).  +
Chrysopsis linearifolia subsp. dressii +
Flowering Sep–Nov.  +
Chrysopsis linearifolia subsp. linearifolia +
Flowering Sep–Nov, rarely spring.  +
Chrysopsis mariana +
Flowering Aug–Sep (n) to Nov–Dec (occasionally spring, Florida).  +
Chrysopsis scabrella +
Flowering Aug–Nov (rarely spring).  +
Chrysopsis subulata +
Flowering (May–)Jul–Aug(–Sep).  +
Chrysosplenium americanum +
Flowering Mar–Jul.  +
Chrysosplenium glechomifolium +
Flowering Feb–May.  +
Chrysosplenium iowense +
Flowering May–Jun.  +
Chrysosplenium rosendahlii +
Flowering Jun–Aug.  +
Chrysosplenium tetrandrum +
Flowering May–Aug.  +
Chrysosplenium wrightii +
Flowering Jun–Aug.  +
Chrysothamnus depressus +
Flowering late summer–fall.  +
Chrysothamnus eremobius +
Flowering late summer–fall.  +
Chrysothamnus greenei +
Flowering summer–fall.  +
Chrysothamnus humilis +
Flowering summer–fall.  +
Chrysothamnus molestus +
Flowering late summer–fall.  +
Chrysothamnus scopulorum +
Flowering late summer–fall.  +
Chrysothamnus stylosus +
Flowering summer–fall.  +
Chrysothamnus vaseyi +
Flowering summer–fall.  +
Chrysothamnus viscidiflorus subsp. axillaris +
Flowering summer–fall.  +
Chrysothamnus viscidiflorus subsp. lanceolatus +
Flowering summer–fall.  +
Chrysothamnus viscidiflorus subsp. planifolius +
Flowering late summer–fall.  +
Chrysothamnus viscidiflorus subsp. puberulus +
Flowering summer–fall.  +
Chrysothamnus viscidiflorus subsp. viscidiflorus +
Flowering summer–fall.  +
Chylismia arenaria +
Flowering Mar–Apr.  +
Chylismia atwoodii +
Flowering Aug–Nov.  +
Chylismia brevipes subsp. arizonica +
Flowering Feb–Apr.  +
Chylismia brevipes subsp. brevipes +
Flowering Feb–May.  +
Chylismia brevipes subsp. pallidula +
Flowering Mar–May.  +
Chylismia cardiophylla subsp. cardiophylla +
Flowering Mar–May.  +
Chylismia cardiophylla subsp. robusta +
Flowering Mar–May.  +
Chylismia claviformis subsp. aurantiaca +
Flowering (Dec–)Feb–Jun.  +
Chylismia claviformis subsp. claviformis +
Flowering Mar–May.  +
Chylismia claviformis subsp. cruciformis +
Flowering Mar–May.  +
Chylismia claviformis subsp. funerea +
Flowering Feb–May.  +
Chylismia claviformis subsp. integrior +
Flowering Apr–Jun.  +
Chylismia claviformis subsp. lancifolia +
Flowering Apr–Jul.  +
Chylismia claviformis subsp. peeblesii +
Flowering (Dec–)Jan–Apr.  +
Chylismia claviformis subsp. peirsonii +
Flowering Feb–Apr.  +
Chylismia claviformis subsp. rubescens +
Flowering Mar–Apr.  +
Chylismia claviformis subsp. yumae +
Flowering Feb–May.  +
Chylismia confertiflora +
Flowering Apr–May.  +
Chylismia eastwoodiae +
Flowering Apr–Jun.  +
Chylismia exilis +
Flowering Apr–Jun.  +
Chylismia heterochroma +
Flowering May–Jun.  +
Chylismia megalantha +
Flowering Jun–Oct.  +
Chylismia multijuga +
Flowering Mar–Jun(–Sep).  +
Chylismia munzii +
Flowering Mar–Jun.  +
Chylismia parryi +
Flowering May–Jun(–Sep).  +
Chylismia scapoidea subsp. brachycarpa +
Flowering May–Jun.  +
Chylismia scapoidea subsp. macrocarpa +
Flowering May–Jun.  +
Chylismia scapoidea subsp. scapoidea +
Flowering Mar–May.  +
Chylismia scapoidea subsp. utahensis +
Flowering May–Jun.  +
Chylismia specicola subsp. hesperia +
Flowering May–Oct.  +
Chylismia specicola subsp. specicola +
Flowering Jun–Sep.  +
Chylismia walkeri subsp. tortilis +
Flowering Apr–Jun.  +
Chylismia walkeri subsp. walkeri +
Flowering Apr–Jun.  +
Chylismiella pterosperma +
Flowering Apr–Jun.  +
Cicendia quadrangularis +
Flowering spring–early summer.  +
Cichorium intybus +
Flowering Apr–Jul.  +
Cienfuegosia drummondii +
Flowering winter–spring.  +
Cienfuegosia yucatanensis +
Flowering spring–summer.  +
Cimicifuga americana +
Flowering summer–fall (Aug–Oct).  +
Cimicifuga arizonica +
Flowering summer (Jul–Aug).  +
Cimicifuga elata +
Flowering summer (Jun-early Aug).  +
Cimicifuga laciniata +
Flowering summer (Aug–Sep).  +
Cimicifuga racemosa +
Flowering summer (Jun–Sep).  +
Cimicifuga rubifolia +
Flowering summer–fall (Aug–Oct).  +
Cinclidium arcticum +
Capsules mature summer.  +
Cinclidium latifolium +
Capsules mature summer.  +
Cinclidium stygium +
Capsules mature summer.  +
Cinclidium subrotundum +
Spores 25-70 µm, mature summer.  +
Cinnamomum camphora +
Flowering spring (Apr–May).  +
Circaea alpina subsp. alpina +
Flowering summer.  +
Circaea alpina subsp. pacifica +
Flowering summer.  +
Circaea canadensis subsp. canadensis +
Flowering summer.  +
Circaea ×sterilis +
Flowering summer.  +
Cirsium altissimum +
Flowering summer–fall (Jun–Oct).  +
Cirsium andersonii +
Flowering summer (Jul–Sep).  +
Cirsium andrewsii +
Flowering spring–summer (May–Sep).  +
Cirsium arizonicum var. arizonicum +
Flowering spring–fall (May–Oct).  +
Cirsium arizonicum var. bipinnatum +
Flowering spring–summer (May–Oct).  +
Cirsium arizonicum var. chellyense +
Flowering summer (Jun–Sep).  +
Cirsium arizonicum var. rothrockii +
Flowering summer–fall (Jun–Oct).  +
Cirsium arizonicum var. tenuisectum +
Flowering summer–fall (Jun–Nov).  +
Cirsium arvense +
Flowering summer (Jun–Oct).  +
Cirsium barnebyi +
Flowering summer (Jun–Sep).  +
Cirsium brevifolium +
Flowering summer (Jun–Oct).  +
Cirsium brevistylum +
Flowering spring–summer (Apr–Sep).  +
Cirsium canescens +
Flowering spring–summer (May–Aug).  +
Cirsium carolinianum +
Flowering spring–summer (Apr–Jul).  +
Cirsium ciliolatum +
Flowering spring–summer (May–Aug).  +
Cirsium clavatum var. americanum +
Flowering summer (Jun–Sep).  +
Cirsium clavatum var. clavatum +
Flowering summer (Jun–Sep).  +
Cirsium clavatum var. osterhoutii +
Flowering summer (Jul–Aug).  +
Cirsium crassicaule +
Flowering spring (Apr–Jun).  +
Cirsium cymosum var. canovirens +
Flowering spring–summer (Apr–Aug).  +
Cirsium cymosum var. cymosum +
Flowering spring–summer (Apr–Aug).  +
Cirsium discolor +
Flowering summer–fall (Jun–Oct).  +
Cirsium douglasii var. breweri +
Flowering summer (Jun–Aug).  +
Cirsium douglasii var. douglasii +
Flowering summer (Jun–Aug).  +
Cirsium drummondii +
Flowering summer (Jun–Aug).  +
Cirsium eatonii var. clokeyi +
Flowering summer (Jul–Sep).  +
Cirsium eatonii var. eatonii +
Flowering summer (Jul–Sep).  +
Cirsium eatonii var. eriocephalum +
Flowering summer (Jul–Sep).  +
Cirsium eatonii var. hesperium +
Flowering summer (Jul–Sep).  +
Cirsium eatonii var. murdockii +
Flowering summer (Jul–Sep).  +
Cirsium eatonii var. peckii +
Flowering summer (Jun–Aug).  +
Cirsium eatonii var. viperinum +
Flowering summer (Jul–Sep).  +
Cirsium edule var. edule +
Flowering summer (Jun–Aug).  +
Cirsium edule var. macounii +
Flowering Jun–Oct.  +
Cirsium edule var. wenatchense +
Flowering summer (Jul–Aug).  +
Cirsium engelmannii +
Flowering spring–summer (May–Jul).  +
Cirsium flodmanii +
Flowering summer (Jun–Sep).  +
Cirsium foliosum +
Flowering summer (Jul–Aug).  +
Cirsium fontinale var. campylon +
Flowering spring–summer (Apr–Aug).  +
Cirsium fontinale var. fontinale +
Flowering spring–summer (Apr–Aug).  +
Cirsium fontinale var. obispoense +
Flowering winter–summer (Jan–Sep).  +
Cirsium grahamii +
Flowering Jul–Sep.  +
Cirsium helenioides +
Flowering summer (Jul–Aug).  +
Cirsium hookerianum +
Flowering summer (Jun–Sep).  +
Cirsium horridulum var. horridulum +
Flowering winter–spring (Apr–Jun).  +
Cirsium horridulum var. megacanthum +
Flowering spring (Mar–Jun).  +
Cirsium horridulum var. vittatum +
Flowering winter–summer (Feb–Aug).  +
Cirsium hydrophilum var. hydrophilum +
Flowering spring–summer (May–Sep).  +
Cirsium hydrophilum var. vaseyi +
Flowering spring–summer (May–Jul).  +
Cirsium inamoenum var. davisii +
Flowering summer (Jun–Aug).  +
Cirsium inamoenum var. inamoenum +
Flowering summer (Jun–Aug).  +
Cirsium joannae +
Flowering summer (Aug–Sep).  +
Cirsium kamtschaticum +
Flowering summer (Jul–Sep).  +
Cirsium lecontei +
Flowering spring–summer (May–Aug).  +
Cirsium longistylum +
Flowering summer (Jun–Aug).  +
Cirsium mohavense +
Flowering summer–fall (Jun–Oct).  +
Cirsium muticum +
Flowering summer (Jul–Sep).  +
Cirsium neomexicanum +
Flowering spring–summer (Mar–Jul).  +
Cirsium nuttallii +
Flowering summer (Jun–Aug).  +
Cirsium occidentale var. californicum +
Flowering spring–summer (Apr–Aug).  +
Cirsium occidentale var. candidissimum +
Flowering summer (Apr–Sep).  +
Cirsium occidentale var. compactum +
Flowering winter–summer (Feb–Jul).  +
Cirsium occidentale var. coulteri +
Flowering spring–summer (Mar–Jun).  +
Cirsium occidentale var. lucianum +
Flowering spring–summer (Apr–Jul).  +
Cirsium occidentale var. occidentale +
Flowering spring–summer (Mar–Jul).  +
Cirsium occidentale var. venustum +
Flowering spring–summer (Apr–Jul).  +
Cirsium ochrocentrum var. martinii +
Flowering spring–autumn (May–Sep).  +
Cirsium ochrocentrum var. ochrocentrum +
Flowering spring–summer (May–Sep).  +
Cirsium ownbeyi +
Flowering summer (Jun–Aug).  +
Cirsium palustre +
Flowering summer (Jul–Aug).  +
Cirsium parryi +
Flowering summer–fall (Jul–Oct).  +
Cirsium perplexans +
Flowering spring–summer (May–Aug).  +
Cirsium pitcheri +
Flowering spring–summer (May–Sep).  +
Cirsium praeteriens +
Flowering summer (Jun–Jul).  +
Cirsium pulcherrimum var. aridum +
Flowering summer (Jun–Aug).  +
Cirsium pulcherrimum var. pulcherrimum +
Flowering summer (Jun–Aug).  +
Cirsium pumilum var. hillii +
Flowering summer (Jun–Aug).  +
Cirsium pumilum var. pumilum +
Flowering summer (Jun–Sep).  +
Cirsium quercetorum +
Flowering spring–summer (Apr–Aug).  +
Cirsium remotifolium var. odontolepis +
Flowering summer (Jun–Sep).  +
Cirsium remotifolium var. remotifolium +
Flowering late spring–summer (May–Aug).  +
Cirsium remotifolium var. rivulare +
Flowering late spring–summer (May–Aug).  +
Cirsium repandum +
Flowering spring–summer (May–Jul).  +
Cirsium rhothophilum +
Flowering mostly spring–summer (Apr–Aug), occasionally year round.  +
Cirsium rydbergii +
Flowering spring–summer (May–Sep).  +
Cirsium scariosum var. americanum +
Flowering summer (Jun–Aug).  +
Cirsium scariosum var. citrinum +
Flowering mostly spring–summer (Apr–Jul, occasionally as late as Nov in coastal sites).  +
Cirsium scariosum var. coloradense +
Flowering summer (Jun–Sep).  +
Cirsium scariosum var. congdonii +
Flowering summer (Jun–Aug).  +
Cirsium scariosum var. robustum +
Flowering summer (Jun–Jul).  +
Cirsium scariosum var. scariosum +
Flowering summer (Jun–Sep).  +
Cirsium scariosum var. thorneae +
Flowering summer (Jun–Sep).  +
Cirsium scariosum var. toiyabense +
Flowering spring–summer (May–Aug).  +
Cirsium texanum +
Flowering spring–summer (Apr–Jul).  +
Cirsium tracyi +
Flowering late spring–summer (Jun–Aug).  +
Cirsium turneri +
Flowering summer (Jun–Sep).  +
Cirsium undulatum +
Flowering spring–autumn (May–Oct).  +
Cirsium vinaceum +
Flowering spring–summer (May–Sep).  +
Cirsium virginianum +
Flowering summer–fall (Aug–Oct).  +
Cirsium vulgare +
Flowering mostly summer (Jun–Sep), year round in areas with mild climates.  +
Cirsium wheeleri +
Flowering summer–fall (Jul–Oct).  +
Cirsium wrightii +
Flowering summer–fall (Aug–Oct).  +
Cissampelos pareira +
Flowering summer–winter.  +
Cissus trifoliata +
Flowering late Apr–Jun  +, fruiting Aug–Sep.  +
Cissus verticillata +
Flowering and fruiting year-round.  +
Cistanthe ambigua +
Flowering Nov–Feb.  +
Cistanthe maritima +
Flowering Mar–Apr.  +
Cistanthe monandra +
Flowering Mar–Jun.  +
Cistanthe monosperma +
Flowering Apr–Sep.  +
Cistanthe parryi +
Flowering Jun–Jul.  +
Cistanthe pulchella +
Flowering Apr–May.  +
Cistanthe pygmaea +
Flowering Jun–Jul.  +
Cistanthe quadripetala +
Flowering Apr–Jun.  +
Cistanthe rosea +
Flowering May–Aug.  +
Cistanthe tweedyi +
Flowering May–Jul.  +
Cistanthe umbellata +
Flowering May–Oct.  +
Cistus incanus +
Flowering (Jan–)Mar–Aug.  +
Cistus ladanifer +
Flowering Feb–Aug.  +
Cistus monspeliensis +
Flowering May–Oct.  +
Cistus psilosepalus +
Flowering May–Oct.  +
Cistus salviifolius +
Flowering Apr–May.  +
Citrullus afer +
Flowering Jun–Oct(–Nov).  +
Citrullus colocynthis +
Flowering Jun–Sep.  +
Citrullus lanatus subsp. lanatus +
Flowering Jun–Nov.  +
Cladanthus mixtus +
Flowering Jun.  +
Cladium californicum +
Fruiting and flowering late spring–summer.  +
Cladium jamaicense +
Fruiting spring–summer.  +
Cladium mariscoides +
Fruiting summer–early fall.  +
Clappia suaedifolia +
Flowering year round, mostly spring and fall.  +
Clarkia affinis +
Flowering Apr–Jun.  +
Clarkia amoena subsp. amoena +
Flowering Jun–Aug.  +
Clarkia amoena subsp. caurina +
Flowering Jun–Aug.  +
Clarkia amoena subsp. huntiana +
Flowering Jun–Aug.  +
Clarkia amoena subsp. lindleyi +
Flowering Jul–Aug.  +
Clarkia amoena subsp. whitneyi +
Flowering Jul–Aug.  +
Clarkia arcuata +
Flowering Apr–Jun.  +
Clarkia australis +
Flowering Jun–Jul.  +
Clarkia biloba subsp. australis +
Flowering May–Jun.  +
Clarkia biloba subsp. biloba +
Flowering May–Aug.  +
Clarkia biloba subsp. brandegeeae +
Flowering Jun–Jul.  +
Clarkia borealis subsp. arida +
Flowering Jun–Aug.  +
Clarkia borealis subsp. borealis +
Flowering Jun–Jul.  +
Clarkia bottae +
Flowering Apr–Jul.  +
Clarkia breweri +
Flowering Apr–Jun.  +
Clarkia concinna subsp. automixa +
Flowering Apr–Jun.  +
Clarkia concinna subsp. concinna +
Flowering Apr–Jul.  +
Clarkia concinna subsp. raichei +
Flowering Apr–May.  +
Clarkia cylindrica subsp. clavicarpa +
Flowering Apr–Jun.  +
Clarkia cylindrica subsp. cylindrica +
Flowering Apr–Jun.  +
Clarkia davyi +
Flowering Apr–Jun.  +
Clarkia delicata +
Flowering Apr–May.  +
Clarkia dudleyana +
Flowering May–Jul.  +
Clarkia epilobioides +
Flowering Apr–May.  +
Clarkia exilis +
Flowering Apr–May.  +
Clarkia franciscana +
Flowering May–Jun.  +
Clarkia gracilis subsp. albicaulis +
Flowering May–Jul.  +
Clarkia gracilis subsp. gracilis +
Flowering Apr–Jul.  +
Clarkia gracilis subsp. sonomensis +
Flowering May–Jun.  +
Clarkia gracilis subsp. tracyi +
Flowering May–Jul.  +
Clarkia heterandra +
Flowering May–Jul.  +
Clarkia imbricata +
Flowering Jun–Jul.  +
Clarkia jolonensis +
Flowering Apr–Jun.  +
Clarkia lassenensis +
Flowering May–Jun.  +
Clarkia lewisii +
Flowering Jun.  +
Clarkia lingulata +
Flowering May–Jun.  +
Clarkia mildrediae subsp. lutescens +
Flowering Jun–Jul.  +
Clarkia mildrediae subsp. mildrediae +
Flowering Jun–Jul.  +
Clarkia modesta +
Flowering Apr–Jun.  +
Clarkia mosquinii +
Flowering Jun–Jul.  +
Clarkia prostrata +
Flowering May–Jul.  +
Clarkia pulchella +
Flowering May–Jul.  +
Clarkia purpurea subsp. purpurea +
Flowering Apr–Jun.  +
Clarkia purpurea subsp. quadrivulnera +
Flowering Apr–Aug.  +
Clarkia purpurea subsp. viminea +
Flowering May–Jul.  +
Clarkia rhomboidea +
Flowering May–Sep.  +
Clarkia rostrata +
Flowering Apr–May.  +
Clarkia rubicunda +
Flowering May–Aug.  +
Clarkia similis +
Flowering Apr–Jun.  +
Clarkia speciosa subsp. immaculata +
Flowering May–Jul.  +
Clarkia speciosa subsp. nitens +
Flowering May–Jul.  +
Clarkia speciosa subsp. polyantha +
Flowering May–Jul.  +
Clarkia speciosa subsp. speciosa +
Flowering May–Jul.  +
Clarkia springvillensis +
Flowering May.  +
Clarkia stellata +
Flowering Jun–Jul.  +
Clarkia tembloriensis subsp. calientensis +
Flowering Apr.  +
Clarkia tembloriensis subsp. tembloriensis +
Flowering Apr–May.  +
Clarkia unguiculata +
Flowering Apr–Sep.  +
Clarkia virgata +
Flowering Jun–Jul.  +
Clarkia williamsonii +
Flowering Apr–Sep.  +
Clarkia xantiana subsp. parviflora +
Flowering May–Jun.  +
Clarkia xantiana subsp. xantiana +
Flowering May–Jun.  +
Claytonia acutifolia +
Flowering Jun–Aug.  +
Claytonia arctica +
Flowering Jun–Jul.  +
Claytonia arenicola +
Flowering early Mar.  +
Claytonia caroliniana +
Flowering Mar–Jun.  +
Claytonia cordifolia +
Flowering May–Sep.  +
Claytonia exigua subsp. exigua +
Flowering Jan–Apr.  +
Claytonia exigua subsp. glauca +
Flowering Feb–Apr.  +
Claytonia gypsophiloides +
Flowering Feb–May.  +
Claytonia lanceolata +
Flowering Apr–Jul.  +
Claytonia megarhiza +
Flowering May–Aug.  +
Claytonia multiscapa +
Flowering May–Aug.  +
Claytonia nevadensis +
Flowering May–Aug.  +
Claytonia ogilviensis +
Flowering May–Jul.  +
Claytonia palustris +
Flowering May–Aug.  +
Claytonia parviflora subsp. grandiflora +
Flowering Feb–Apr.  +
Claytonia parviflora subsp. parviflora +
Flowering Mar–Jun.  +
Claytonia parviflora subsp. utahensis +
Flowering Apr–Jul.  +
Claytonia parviflora subsp. viridis +
Flowering Mar–May.  +
Claytonia perfoliata subsp. intermontana +
Flowering Apr–Jun.  +
Claytonia perfoliata subsp. mexicana +
Flowering Feb–Apr.  +
Claytonia perfoliata subsp. perfoliata +
Flowering Jan–May.  +
Claytonia rosea +
Flowering Feb–May.  +
Claytonia rubra subsp. depressa +
Flowering Feb–Apr.  +
Claytonia rubra subsp. rubra +
Flowering Apr–Jul.  +
Claytonia sarmentosa +
Flowering May–Aug.  +
Claytonia saxosa +
Flowering early spring.  +
Claytonia scammaniana +
Flowering Jun–Jul.  +
Claytonia sibirica +
Flowering Feb–Aug.  +
Claytonia tuberosa +
Flowering May–Aug.  +
Claytonia umbellata +
Flowering May–Aug.  +
Claytonia virginica +
Flowering Mar–Apr.  +
Claytonia washingtoniana +
Flowering Jan–Jun.  +
Cleistes bifaria +
Flowering Apr–May (coastal plain) –Jul (mountains).  +
Cleistes divaricata +
Flowering May (Fla)–Jul (Del).  +
Cleistocarpidium palustre +
Capsules mature early summer (May–Jun).  +
Clematis addisonii +
Flowering spring–early summer.  +
Clematis albicoma +
Flowering spring–early summer.  +
Clematis baldwinii +
Flowering all year.  +
Clematis bigelovii +
Flowering spring–fall.  +
Clematis catesbyana +
Flowering spring–summer (May–Jul).  +
Clematis coactilis +
Flowering spring–early summer.  +
Clematis columbiana var. columbiana +
Flowering spring–early summer(-fall).  +
Clematis columbiana var. tenuiloba +
Flowering late spring–early summer.  +
Clematis crispa +
Flowering spring–summer.  +
Clematis drummondii +
Flowering spring–fall (Mar–Oct).  +
Clematis fremontii +
Flowering spring.  +
Clematis glaucophylla +
Flowering spring–summer.  +
Clematis hirsutissima var. hirsutissima +
Flowering spring–summer.  +
Clematis hirsutissima var. scottii +
Flowering spring–summer.  +
Clematis lasiantha +
Flowering winter–spring (Jan–Jun).  +
Clematis ligusticifolia +
Flowering summer (Jun–Sep).  +
Clematis morefieldii +
Flowering spring–early summer.  +
Clematis occidentalis var. dissecta +
Flowering spring.  +
Clematis occidentalis var. grosseserrata +
Flowering spring–early summer.  +
Clematis occidentalis var. occidentalis +
Flowering spring.  +
Clematis ochroleuca +
Flowering spring.  +
Clematis orientalis +
Flowering summer–fall.  +
Clematis pauciflora +
Flowering winter–fall (Jan–Oct  +, usually Mar–Apr).  +
Clematis pitcheri var. dictyota +
Flowering spring–fall (Apr–Sep).  +
Clematis pitcheri var. pitcheri +
Flowering spring–fall (Mar–Oct).  +
Clematis recta +
Flowering summer (Jun–Jul).  +
Clematis reticulata +
Flowering spring–summer (May–Jun).  +
Clematis socialis +
Flowering spring–fall.  +
Clematis tangutica var. tangutica +
Flowering summer–early fall.  +
Clematis terniflora +
Flowering summer (Jul–Sep).  +
Clematis texensis +
Flowering spring–summer (Mar–Jun).  +
Clematis versicolor +
Flowering spring–summer (Jun–Aug).  +
Clematis viorna +
Flowering spring–summer.  +
Clematis virginiana +
Flowering summer (Jun–Sep).  +
Clematis vitalba +
Flowering summer (Jun–Aug).  +
Clematis viticaulis +
Flowering spring–early summer.  +
Clematis viticella +
Flowering summer–fall.  +
Cleome ornithopodioides +
Flowering summer.  +
Cleome rutidosperma +
Flowering ± year-round.  +
Cleomella angustifolia +
Flowering mid spring–summer.  +
Cleomella brevipes +
Flowering spring–fall.  +
Cleomella hillmanii var. goodrichii +
Flowering spring.  +
Cleomella hillmanii var. hillmanii +
Flowering spring.  +
Cleomella longipes +
Flowering late spring–late summer.  +
Cleomella obtusifolia +
Flowering late winter–fall.  +
Cleomella palmeriana +
Flowering spring–early fall.  +
Cleomella parviflora +
Flowering spring–summer.  +
Cleomella plocasperma +
Flowering mid spring–fall.  +
Cleoserrata serrata +
Flowering summer.  +
Cleoserrata speciosa +
Flowering summer.  +
Clethra acuminata +
Flowering summer.  +
Clethra alnifolia +
Flowering summer.  +
Clethra tomentosa +
Flowering summer.  +
Cliftonia monophylla +
Flowering Mar–May.  +
Climacium americanum +
Capsules mature fall.  +
Climacium dendroides +
Capsules mature fall.  +
Clintonia andrewsiana +
Flowering late Apr–late Jun.  +
Clintonia borealis +
Flowering early May–early Jul.  +
Clintonia umbellulata +
Flowering early May–late Jun.  +
Clintonia uniflora +
Flowering late May–Jul.  +
Clusia rosea +
Flowering summer.  +
Cnidoscolus angustidens +
Flowering May–Sep.  +
Cnidoscolus stimulosus +
Flowering Mar–Aug.  +
Cnidoscolus texanus +
Flowering mainly Apr–Jul(–Nov).  +
Coccinia grandis +
Flowering May–Nov.  +
Coccoloba diversifolia +
Flowering year-round.  +
Coccoloba uvifera +
Flowering year-round.  +
Coccothrinax argentata +
Flowering spring–fall.  +
Cocculus carolinus +
Flowering late spring–early fall.  +
Cocculus diversifolius +
Flowering spring–fall.  +
Cochlearia groenlandica +
Flowering Jun–Aug.  +
Cochlearia sessilifolia +
Flowering Jul–Aug.  +
Cochlearia tridactylites +
Flowering Jul–Aug.  +
Cocos nucifera +
Flowering throughout the year.  +
Coeloglossum viride +
Flowering late spring–summer.  +
Coelophragmus auriculatus +
Flowering Mar–Nov.  +
Coincya monensis subsp. recurvata +
Flowering May–Aug.  +
Coleogyne ramosissima +
Flowering Apr–May  +, fruiting Jun–Oct.  +
Collinsia antonina +
Flowering Mar–Apr.  +
Collinsia bartsiifolia var. bartsiifolia +
Flowering Mar–Jun.  +
Collinsia bartsiifolia var. davidsonii +
Flowering Apr–Jun.  +
Collinsia bartsiifolia var. hirsuta +
Flowering Apr–Jun.  +
Collinsia bartsiifolia var. stricta +
Flowering May–Jul.  +
Collinsia callosa +
Flowering Apr–Jun.  +
Collinsia childii +
Flowering (Apr–)May–Jul.  +
Collinsia concolor +
Flowering Apr–Jun.  +
Collinsia corymbosa +
Flowering Apr–Jun.  +
Collinsia grandiflora +
Flowering (Mar–)May–Jul.  +
Collinsia greenei +
Flowering Apr–Jul(–Aug).  +
Collinsia heterophylla var. austromontana +
Flowering May–Jul(–Aug).  +
Collinsia heterophylla var. heterophylla +
Flowering Mar–Jun.  +
Collinsia latifolia +
Flowering Jun–Aug.  +
Collinsia linearis +
Flowering (Apr–)May–Jul.  +
Collinsia multicolor +
Flowering Mar–May.  +
Collinsia parryi +
Flowering Apr–May(–Jun).  +
Collinsia parviflora +
Flowering Mar–Jul.  +
Collinsia rattanii +
Flowering May–Jul(–Aug).  +
Collinsia sparsiflora var. collina +
Flowering Mar–May.  +
Collinsia sparsiflora var. sparsiflora +
Flowering Mar–May.  +
Collinsia tinctoria +
Flowering May–Aug.  +
Collinsia torreyi +
Flowering May–Aug.  +
Collinsia verna +
Flowering Apr–Jun.  +
Collinsia violacea +
Flowering Apr–Jun.  +
Collinsia wrightii +
Flowering May–Aug.  +
Colocasia esculenta +
Flowering late spring–late fall.  +
Colubrina arborescens +
Flowering Nov–Feb, possibly year-round.  +
Colubrina asiatica var. asiatica +
Flowering year-round.  +
Colubrina californica +
Flowering (Dec–)Mar–May.  +
Colubrina cubensis var. floridana +
Flowering Feb–Mar, possibly year-round.  +
Colubrina elliptica +
Flowering Sep–Feb, possibly year-round.  +
Colubrina greggii +
Flowering Feb–Mar.  +
Colubrina stricta +
Flowering Mar–Jun.  +
Colubrina texensis +
Flowering Mar–May.  +
Columbiadoria hallii +
Flowering Aug–Oct.  +
Comandra umbellata subsp. californica +
Flowering Mar–Jul.  +
Comandra umbellata subsp. pallida +
Flowering Mar–Jul.  +
Comandra umbellata subsp. umbellata +
Flowering Mar–Aug.  +
Comarostaphylis diversifolia subsp. diversifolia +
Flowering Mar–Jun  +, fruiting (Mar-)Jun–Sep.  +
Comarostaphylis diversifolia subsp. planifolia +
Flowering (Jan-)Mar–Jul  +, fruiting (Apr-)May–Sep(-Oct).  +
Comarum palustre +
Flowering summer.  +
Comastoma tenellum +
Flowering summer–early fall.  +
Combretum indicum +
Flowering spring–summer.  +
Commelina benghalensis +
Flowering spring–fall.  +
Commelina caroliniana +
Flowering summer–fall (rarely winter).  +
Commelina communis +
Flowering summer–fall.  +
Commelina dianthifolia +
Flowering summer–fall.  +
Commelina diffusa var. diffusa +
Flowering spring–fall.  +
Commelina diffusa var. gigas +
Flowering spring–fall (perhaps all year round).  +
Commelina erecta +
Flowering spring–fall.  +
Commelina forskaolii +
Flowering summer–winter.  +
Commelina gambiae +
Flowering fall.  +
Commelina virginica +
Flowering midsummer–fall.  +
Commicarpus scandens +
Flowering late spring-mid fall.  +
Comptonia peregrina +
Flowering spring, fruiting summer.  +
Condalia correllii +
Flowering Mar–May.  +
Condalia ericoides +
Flowering Mar–Sep.  +
Condalia globosa var. pubescens +
Flowering mainly Jan–Apr, sporadically year-round.  +
Condalia hookeri +
Flowering (Mar–)Apr–Jul(–Oct).  +
Condalia spathulata +
Flowering Apr–Jul.  +
Condalia viridis +
Flowering May–Aug.  +
Condalia warnockii var. kearneyana +
Flowering Jul–Sep(–Oct).  +
Condalia warnockii var. warnockii +
Flowering Jun–Aug.  +
Conicosia pugioniformis +
Flowering spring–fall.  +
Conimitella williamsii +
Flowering early summer.  +
Conocarpus erectus +
Flowering spring–fall.  +
Conoclinium betonicifolium var. betonicifolium +
Flowering Apr–Jun, Sep–Oct.  +
Conoclinium betonicifolium var. integrifolium +
Flowering Apr–Jun, Sep–Oct.  +
Conoclinium coelestinum +
Flowering (Jun–)Aug–Nov.  +
Conoclinium dissectum +
Flowering Apr–Aug, Oct–Nov.  +
Conopholis alpina +
Flowering Feb–Jul.  +
Conopholis americana +
Flowering Feb–Jun.  +
Conostomum tetragonum +
Capsules mature Jun–Aug.  +
Conringia orientalis +
Flowering (Mar in Texas) May–Aug.  +
Consolea corallicola +
Flowering year-round (peak Dec–Apr).  +
Consolida ajacis +
Flowering summer.  +
Consolida pubescens +
Flowering summer.  +
Consolida regalis +
Flowering summer.  +
Consolida tenuissima +
Flowering summer.  +
Constancea nevinii +
Flowering Apr–Sep.  +
Convallaria majalis var. majalis +
Flowering early–late spring.  +
Convallaria majalis var. montana +
Flowering mid–late spring.  +
Convolvulus arvensis +
Flowering Apr–Oct.  +
Convolvulus crenatifolius subsp. crenatifolius +
Flowering Apr–Jul.  +
Convolvulus equitans +
Flowering year-round.  +
Convolvulus simulans +
Flowering Mar–Jun.  +
Conyza bonariensis +
Flowering year round, mostly late summer–fall.  +
Conyza canadensis +
Flowering year round, mostly summer–fall.  +
Conyza floribunda +
Flowering summer–fall.  +
Conyza ramosissima +
Flowering late spring–early fall.  +
Coptis aspleniifolia +
Flowering spring.  +
Coptis laciniata +
Flowering spring–summer.  +
Coptis occidentalis +
Flowering spring.  +
Coptis trifolia +
Flowering late spring–summer (May–Aug).  +
Corallorhiza bentleyi +
Flowering mid–late July.  +
Corallorhiza maculata var. maculata +
Flowering May–Aug.  +
Corallorhiza maculata var. occidentalis +
Flowering Apr–Jul.  +
Corallorhiza mertensiana +
Flowering late spring–summer.  +
Corallorhiza odontorhiza var. odontorhiza +
Flowering mid Aug–Oct.  +
Corallorhiza odontorhiza var. pringlei +
Flowering late summer–fall.  +
Corallorhiza striata var. striata +
Flowering spring–early summer.  +
Corallorhiza striata var. vreelandii +
Flowering spring–summer.  +
Corallorhiza trifida +
Flowering spring–summer.  +
Corallorhiza wisteriana +
Flowering Jan–Jul, according to latitude.  +
Corchorus aestuans +
Flowering Jul–Sep(–Oct).  +
Corchorus hirsutus +
Flowering Jul–Oct.  +
Corchorus hirtus +
Flowering Jun–Nov.  +
Corchorus siliquosus +
Flowering Mar–Oct(–Dec).  +
Corchorus tridens +
Flowering Mar–Oct.  +
Cordylanthus capitatus +
Flowering Jul–Oct.  +
Cordylanthus eremicus subsp. eremicus +
Flowering Aug–Sep.  +
Cordylanthus eremicus subsp. kernensis +
Flowering Jun–Sep.  +
Cordylanthus kingii subsp. densiflorus +
Flowering Jun–Aug.  +
Cordylanthus kingii subsp. helleri +
Flowering Jun–Sep.  +
Cordylanthus kingii subsp. kingii +
Flowering Jun–Aug.  +
Cordylanthus laxiflorus +
Flowering Jul–Oct.  +
Cordylanthus nevinii +
Flowering Jul–Sep.  +
Cordylanthus nidularius +
Flowering Jul–Aug.  +
Cordylanthus parviflorus +
Flowering Aug–Oct.  +
Cordylanthus pilosus subsp. pilosus +
Flowering Jul–Sep.  +
Cordylanthus pilosus subsp. trifidus +
Flowering Jul–Aug.  +
Cordylanthus pringlei +
Flowering Jul–Sep.  +
Cordylanthus ramosus +
Flowering late Jun–Aug.  +
Cordylanthus rigidus subsp. brevibracteatus +
Flowering Jul–Sep.  +
Cordylanthus rigidus subsp. littoralis +
Flowering Jul–Sep.  +
Cordylanthus rigidus subsp. rigidus +
Flowering Jul–Sep.  +
Cordylanthus rigidus subsp. setigerus +
Flowering Jun–Sep.  +
Cordylanthus tenuis subsp. barbatus +
Flowering Jul–Aug.  +
Cordylanthus tenuis subsp. brunneus +
Flowering Jun–Jul.  +
Cordylanthus tenuis subsp. pallescens +
Flowering Jun–Sep.  +
Cordylanthus tenuis subsp. tenuis +
Flowering Jul–Sep.  +
Cordylanthus tenuis subsp. viscidus +
Flowering Jul–Sep.  +
Cordylanthus wrightii subsp. kaibabensis +
Flowering Aug–Sep.  +
Cordylanthus wrightii subsp. tenuifolius +
Flowering Jul–Oct.  +
Cordylanthus wrightii subsp. wrightii +
Flowering Jul–Sep.  +
Corema conradii +
Flowering Apr–Aug.  +
Coreocarpus arizonicus +
Flowering year round, following rains.  +
Coreopsis auriculata +
Flowering Apr–Jun.  +
Coreopsis basalis +
Flowering Apr–Jun.  +
Coreopsis bigelovii +
Flowering Feb–Jun.  +
Coreopsis californica +
Flowering Feb–Jun.  +
Coreopsis calliopsidea +
Flowering Feb–Jun.  +
Coreopsis delphiniifolia +
Flowering May–Jul(–Sep).  +
Coreopsis douglasii +
Flowering Mar–May.  +
Coreopsis gigantea +
Flowering Jan–Jul.  +
Coreopsis gladiata +
Flowering ± year round, mostly Sep–Oct.  +
Coreopsis grandiflora +
Flowering May–Aug.  +
Coreopsis hamiltonii +
Flowering Mar–May.  +
Coreopsis integrifolia +
Flowering Sep–Oct.  +
Coreopsis intermedia +
Flowering May–Jul.  +
Coreopsis lanceolata +
Flowering (Mar–)May–Jul(–Aug).  +
Coreopsis latifolia +
Flowering Aug–Sep.  +
Coreopsis leavenworthii +
Flowering year round, mostly May–Jul.  +
Coreopsis major +
Flowering May–Aug.  +
Coreopsis maritima +
Flowering Feb–Jun.  +
Coreopsis nudata +
Flowering Apr–May.  +
Coreopsis nuecensis +
Flowering Mar–May.  +
Coreopsis palmata +
Flowering Jun–Aug.  +
Coreopsis pubescens +
Flowering (Apr–)Jun–Aug(–Sep).  +
Coreopsis pulchra +
Flowering Jun–Sep.  +
Coreopsis rosea +
Flowering Aug–Sep.  +
Coreopsis stillmanii +
Flowering Mar–May.  +
Coreopsis tinctoria +
Flowering year round, mostly Jun–Aug.  +
Coreopsis tripteris +
Flowering Jul–Sep.  +
Coreopsis verticillata +
Flowering Jun–Jul(–Aug).  +
Corethrogyne filaginifolia +
Flowering year round, mostly Jul–Nov.  +
Corispermum americanum var. americanum +
Flowering late summer–fall.  +
Corispermum americanum var. rydbergii +
Flowering late summer–fall.  +
Corispermum hookeri var. hookeri +
Flowering late summer–fall.  +
Corispermum hookeri var. pseudodeclinatum +
Flowering late summer–fall.  +
Corispermum hyssopifolium +
Flowering summer–early fall.  +
Corispermum navicula +
Flowering late summer–fall.  +
Corispermum nitidum +
Flowering late summer–early fall.  +
Corispermum ochotense var. alaskanum +
Flowering summer–early fall.  +
Corispermum ochotense var. ochotense +
Flowering late summer–early fall.  +
Corispermum pacificum +
Flowering late summer–fall.  +
Corispermum pallasii +
Flowering late summer–fall.  +
Corispermum pallidum +
Flowering late summer–fall.  +
Corispermum villosum +
Flowering late summer–fall.  +
Corispermum welshii +
Flowering late summer–fall.  +
Cornus alternifolia +
Flowering Apr–Jun  +, fruiting Jun–Aug.  +
Cornus amomum +
Flowering May–Aug  +, fruiting Aug–Oct.  +
Cornus asperifolia +
Flowering Apr–Jun  +, fruiting Aug–Sep.  +
Cornus canadensis +
Flowering May–Jul  +, fruiting Aug–Oct.  +
Cornus drummondii +
Flowering Apr–Jul  +, fruiting Aug–Oct.  +
Cornus florida +
Flowering Mar–Jun  +, fruiting Aug–Oct.  +
Cornus foemina +
Flowering Mar–Jun  +, fruiting Aug–Oct.  +
Cornus glabrata +
Flowering May–Jun  +, fruiting Aug–Oct.  +
Cornus kousa +
Flowering Apr–Jul  +, fruiting Aug–Oct.  +
Cornus mas +
Flowering Apr–Jun  +, fruiting Aug–Sep.  +
Cornus nuttallii +
Flowering Apr–Jul, sometimes Sep–Oct  +, fruiting Aug–Oct.  +
Cornus obliqua +
Flowering May–Aug  +, fruiting Aug–Oct.  +
Cornus occidentalis +
Flowering May–Jun and Sep–Oct  +, fruiting Aug–Oct.  +
Cornus racemosa +
Flowering May–Jul  +, fruiting Aug–Oct.  +
Cornus rugosa +
Flowering May–Jul  +, fruiting late Aug–Oct.  +
Cornus sanguinea +
Flowering Apr–Jun  +, fruiting Aug–Sep.  +
Cornus sericea +
Flowering May–Jun and Sep–Oct  +, fruiting Aug–Oct.  +
Cornus sessilis +
Flowering Mar–Jun  +, fruiting Aug–Sep.  +
Cornus suecica +
Flowering May–Jul  +, fruiting Aug–Oct.  +
Cornus unalaschkensis +
Flowering May–Aug  +, fruiting Aug–Oct.  +
Corrigiola litoralis subsp. litoralis +
Flowering summer–fall.  +
Corydalis aqua-gelidae +
Flowering early–late summer.  +
Corydalis aurea subsp. aurea +
Flowering spring–late summer.  +
Corydalis aurea subsp. occidentalis +
Flowering early spring–late summer.  +
Corydalis caseana subsp. brachycarpa +
Flowering mid summer.  +
Corydalis caseana subsp. brandegei +
Flowering early–late summer.  +
Corydalis caseana subsp. caseana +
Flowering early–late summer.  +
Corydalis caseana subsp. cusickii +
Flowering early–late summer.  +
Corydalis caseana subsp. hastata +
Flowering early–late summer.  +
Corydalis crystallina +
Flowering mid-late spring.  +
Corydalis curvisiliqua subsp. curvisiliqua +
Flowering early–late spring.  +
Corydalis curvisiliqua subsp. grandibracteata +
Flowering early–late spring.  +
Corydalis flavula +
Flowering early–late spring.  +
Corydalis micrantha subsp. australis +
Flowering very early–late spring.  +
Corydalis micrantha subsp. micrantha +
Flowering mid-late spring.  +
Corydalis micrantha subsp. texensis +
Flowering very early-mid spring.  +
Corydalis pauciflora +
Flowering early-mid summer.  +
Corydalis scouleri +
Flowering mid spring–early summer.  +
Corydalis sempervirens +
Flowering early summer–early fall.  +
Corylus americana +
Flowering very early spring.  +
Corylus avellana +
Flowering very early spring.  +
Corylus cornuta subsp. californica +
Flowering very early spring.  +
Corylus cornuta subsp. cornuta +
Flowering very early spring.  +
Coryphantha alversonii +
Flowering May–Jun  +, fruiting Jun–Jul.  +
Coryphantha chaffeyi +
Flowering (Mar-)Apr–Jun  +, fruiting Jun–Aug(-Sep), 1-3 months after flowering.  +
Coryphantha chlorantha +
Flowering Apr–Jun(-Sep)  +, fruiting time unknown.  +
Coryphantha dasyacantha +
Flowering Mar–Jul  +, fruiting (May-)Jun–Aug, ca (1 1/2)-(2 1/2) months after flowering.  +
Coryphantha duncanii +
Flowering Feb–Mar(-May)  +, fruiting mostly May.  +
Coryphantha echinus +
Flowering late spring–summer (Apr–Jul)  +, fruiting 2-4 months after flowering.  +
Coryphantha hesteri +
Flowering Apr–Jun(-Nov)  +, fruiting Aug–Oct(-Jan).  +
Coryphantha macromeris +
Flowering Feb–Sep  +, fruiting (May-)Aug–Dec.  +
Coryphantha minima +
Flowering spring (Mar-)Apr–May(-Jun)  +, fruiting late summer–fall.  +
Coryphantha missouriensis +
Flowering Apr–Jun  +, fruiting Jan–Jun(-Jul).  +
Coryphantha nickelsiae +
Flowering summer (Aug–Sep).  +
Coryphantha ramillosa +
Flowering summer–early fall (Aug–Nov)  +, fruiting Nov.  +
Coryphantha recurvata +
Flowering summer  +, fruiting winter (Nov–Jan).  +
Coryphantha robbinsorum +
Flowering Mar–Apr  +, fruiting Jun–Aug.  +
Coryphantha robertii +
Flowering Feb–Mar  +, fruiting 2-3 months after flowering.  +
Coryphantha robustispina +
Flowering spring–summer (Apr–Sep)  +, fruiting fall–winter.  +
Coryphantha sneedii +
Flowering Mar–Jun  +, fruiting May–Sep.  +
Coryphantha sulcata +
Flowering late spring–summer (Apr–May)  +, fruiting ca 3-4 months after flowering.  +
Coryphantha tuberculosa +
Flowering (Apr-)May–Aug  +, fruiting Jul–Oct.  +
Coryphantha vivipara +
Flowering spring–late summer (Apr–Aug)  +, fruiting 2-5 months after flowering.  +
Cosmos bipinnatus +
Flowering summer–fall.  +
Cosmos caudatus +
Flowering summer–fall.  +
Cosmos parviflorus +
Flowering summer–fall.  +
Cosmos sulphureus +
Flowering summer–fall.  +
Cota tinctoria +
Flowering Jul–Sep.  +
Cotoneaster adpressus +
Flowering Apr–May  +, fruiting Sep.  +
Cotoneaster atropurpureus +
Flowering May  +, fruiting Sep–Jan.  +
Cotoneaster cochleatus +
Flowering May–Jun  +, fruiting Sep–Nov.  +
Cotoneaster conspicuus +
Flowering Apr–May  +, fruiting Oct–May.  +
Cotoneaster crispii +
Flowering Jun–Jul  +, fruiting Oct–Feb.  +
Cotoneaster dammeri +
Flowering May–Jun  +, fruiting Sep–Apr.  +
Cotoneaster dielsianus +
Flowering May–Jun  +, fruiting Aug–Mar.  +
Cotoneaster divaricatus +
Flowering Apr–May  +, fruiting Sep–Dec.  +
Cotoneaster fangianus +
Flowering May  +, fruiting Oct–Nov.  +
Cotoneaster franchetii +
Flowering May–Jul  +, fruiting Oct–Apr.  +
Cotoneaster frigidus +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Cotoneaster gamblei +
Flowering May  +, fruiting Sep–Nov.  +
Cotoneaster hjelmqvistii +
Flowering May  +, fruiting Oct–Nov.  +
Cotoneaster hodjingensis +
Flowering Jun  +, fruiting Oct–Nov.  +
Cotoneaster horizontalis +
Flowering Apr–May  +, fruiting Sep–Mar.  +
Cotoneaster integrifolius +
Flowering Apr–Jun  +, fruiting Aug–Mar.  +
Cotoneaster lacteus +
Flowering May–Jul  +, fruiting Nov–Apr.  +
Cotoneaster lucidus +
Flowering Mar–Jul (sometimes reflowering in Sep)  +, fruiting Jul–Oct.  +
Cotoneaster magnificus +
Flowering May–Jun  +, fruiting Sep–Nov.  +
Cotoneaster melanocarpus +
Flowering Apr–May  +, fruiting Jul–Aug.  +
Cotoneaster miniatus +
Flowering May–Jul  +, fruiting Sep–Nov.  +
Cotoneaster monopyrenus +
Flowering May–Jun  +, fruiting Jul–Nov.  +
Cotoneaster nitens +
Flowering Mar–May  +, fruiting Jul–Nov.  +
Cotoneaster pannosus +
Flowering May–Aug  +, fruiting Oct–May.  +
Cotoneaster qungbixiensis +
Flowering Jun–Jul  +, fruiting Oct–Dec.  +
Cotoneaster rehderi +
Flowering May–Jun  +, fruiting Sep–Dec.  +
Cotoneaster salicifolius +
Flowering May–Jun  +, fruiting Oct–Apr.  +
Cotoneaster simonsii +
Flowering May–Jun  +, fruiting Oct–Apr.  +
Cotoneaster sternianus +
Flowering Jun–Jul  +, fruiting Oct–Jan.  +
Cotoneaster tengyuehensis +
Flowering May–Jun  +, fruiting Sep–Feb.  +
Cotoneaster transens +
Flowering Jun  +, fruiting Oct–Nov.  +
Cotoneaster vestitus +
Flowering Jun–Jul  +, fruiting Nov–Mar.  +
Cotoneaster villosulus +
Flowering May (often reflowering Sep)  +, fruiting Aug–Nov.  +
Cotoneaster ×suecicus +
Flowering May–Jun  +, fruiting Oct–May.  +
Cottsia gracilis +
Flowering and fruiting Mar–Oct(–Jan).  +
Cotula australis +
Flowering Jan–Sep.  +
Cotula coronopifolia +
Flowering Mar–Dec.  +
Cotyledon orbiculata var. oblonga +
Flowering early summer.  +
Crambe maritima +
Flowering May–Jul.  +
Cranichis muscosa +
Flowering Jan–Mar.  +
Crassula aquatica +
Flowering late spring–summer.  +
Crassula argentea +
Flowering Mar–Jun.  +
Crassula colligata subsp. lamprosperma +
Flowering spring.  +
Crassula connata +
Flowering spring.  +
Crassula drummondii +
Flowering spring.  +
Crassula longipes +
Flowering spring.  +
Crassula multicava +
Flowering Feb.  +
Crassula solieri +
Flowering spring.  +
Crassula tetragona +
Flowering Mar–Jun.  +
Crassula tillaea +
Flowering spring.  +
Crassula viridis +
Flowering spring.  +
Crataegus aemula +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus aestivalis +
Flowering Feb–Mar (later northward)  +, fruiting May–Jul.  +
Crataegus alabamensis +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus alleghaniensis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus annosa +
Flowering Apr  +, fruiting Sep.  +
Crataegus aprica +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus aquacervensis +
Flowering late May–early Jun  +, fruiting Aug–Sep.  +
Crataegus ashei +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus atrovirens +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus attrita +
Flowering Mar  +, fruiting Aug.  +
Crataegus austromontana +
Flowering early May  +, fruiting Sep–Nov.  +
Crataegus beata +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus berberifolia var. berberifolia +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus berberifolia var. engelmannii +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus biltmoreana +
Flowering Apr, May  +, fruiting Sep–Oct.  +
Crataegus brachyacantha +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus brainerdii +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus brazoria +
Flowering Mar–Apr  +, fruiting Sep–Oct.  +
Crataegus brittonii +
Flowering Apr–May  +, fruiting Sep–Nov.  +
Crataegus buckleyi +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus calpodendron +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus castlegarensis +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus chrysocarpa var. blanchardii +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus chrysocarpa var. chrysocarpa +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus chrysocarpa var. faxonii +
Flowering May  +, fruiting late Sep.  +
Crataegus chrysocarpa var. phoeniceoides +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus chrysocarpa var. piperi +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus chrysocarpa var. praecox +
Flowering May  +, fruiting mid Sep.  +
Crataegus chrysocarpa var. subrotundifolia +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus chrysocarpa var. vernonensis +
Flowering May  +, fruiting late Aug.  +
Crataegus chrysocarpa var. vigintistamina +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus coccinea var. coccinea +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus coccinea var. fulleriana +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus coccinea var. pringlei +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus coccinioides +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus cognata +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus collina var. collina +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus collina var. hirtiflora +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus collina var. lettermanii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus collina var. sordida +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus collina var. succincta +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus colonica +
Flowering early to mid Apr  +, fruiting Aug.  +
Crataegus communis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus compacta +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus condigna +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus craytonii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus crocea +
Flowering late Feb–Apr  +, fruiting Jul–Aug.  +
Crataegus crus-galli var. crus-galli +
Flowering Apr–Jun  +, fruiting Sep–Nov.  +
Crataegus crus-galli var. pyracanthifolia +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus cupressocollina +
Flowering late May–early Jun  +, fruiting Aug–Sep.  +
Crataegus delawarensis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus dispar +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus dodgei +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus douglasii +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus egens +
Flowering late Feb–early Apr  +, fruiting Jul–Aug.  +
Crataegus egregia +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus enderbyensis +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus erythropoda +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus exilis +
Flowering Mar–Apr  +, fruiting Aug–Sep.  +
Crataegus eximia +
Flowering late May  +, fruiting Sep–Oct.  +
Crataegus extraria +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus fecunda +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus flabellata +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus flava +
Flowering early Apr  +, fruiting Sep–Oct.  +
Crataegus florens +
Flowering Mar–Apr  +, fruiting Aug–Sep.  +
Crataegus floridana +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus florifera +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus fluviatilis +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus formosa +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus frugiferens +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus furtiva +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus gattingeri +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus gaylussacia +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus gilva +
Flowering Mar–Apr  +, fruiting Sep–Oct.  +
Crataegus greggiana +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus harbisonii +
Flowering early May  +, fruiting Sep–Nov.  +
Crataegus holmesiana +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ignava +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus incilis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus integra +
Flowering mid Mar–mid Apr  +, fruiting Jul–Aug.  +
Crataegus intricata +
Flowering late Apr, early Jun  +, fruiting Sep–Oct.  +
Crataegus invicta +
Flowering Mar–early Apr  +, fruiting Jul–Aug.  +
Crataegus iracunda +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus irrasa +
Flowering May–Jun  +, fruiting Sep.  +
Crataegus jesupii +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus jonesiae +
Flowering Jun  +, fruiting Sep–Oct.  +
Crataegus lacrimata +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus laevigata +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus lanata +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus lancei +
Flowering Apr–Sep  +, fruiting Aug–Sep.  +
Crataegus lanuginosa +
Flowering late Apr  +, fruiting late Oct.  +
Crataegus lassa +
Flowering Mar–mid Apr  +, fruiting Jul–Aug.  +
Crataegus laurentiana +
Flowering Jun  +, fruiting Sep–Oct.  +
Crataegus leonensis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus lepida +
Flowering Apr–May  +, fruiting Jul–Aug.  +
Crataegus levis +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus lumaria +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus macracantha +
Flowering Apr–Jun  +, fruiting Sep–Oct.  +
Crataegus macrosperma +
Flowering Apr–Jun  +, fruiting Sep–Nov.  +
Crataegus magniflora +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus margarettae var. angustifolia +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus margarettae var. brownii +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus margarettae var. margarettae +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus margarettae var. meiophylla +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus marshallii +
Flowering Mar–Apr  +, fruiting Sep–Nov.  +
Crataegus mendosa +
Flowering Mar–Apr  +, fruiting Sep–Nov.  +
Crataegus meridiana +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus mira +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus mollis var. dumetosa +
Flowering Mar–Apr  +, fruiting Sep–Oct.  +
Crataegus mollis var. incisifolia +
Flowering Mar–May  +, fruiting Sep–Nov.  +
Crataegus mollis var. meridionalis +
Flowering Mar–Apr  +, fruiting Sep–Oct.  +
Crataegus mollis var. mollis +
Flowering Mar–May  +, fruiting Sep–Nov.  +
Crataegus mollis var. viburnifolia +
Flowering Mar  +, fruiting Sep–Oct.  +
Crataegus monogyna var. monogyna +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus munda +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus nananixonii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus neobushii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus nitida +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus oakesiana +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus okanaganensis var. okanaganensis +
Flowering May  +, fruiting late Aug–Sep.  +
Crataegus okanaganensis var. wellsii +
Flowering May  +, fruiting late Aug–Sep.  +
Crataegus okennonii +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus opaca +
Flowering Feb–Mar  +, fruiting May–Jun.  +
Crataegus opima +
Flowering early–mid Apr  +, fruiting Sep–Oct.  +
Crataegus orbicularis +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ouachitensis var. minor +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus ouachitensis var. ouachitensis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus padifolia var. incarnata +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus padifolia var. padifolia +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus pennsylvanica +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus persimilis +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus pexa +
Flowering Mar–Apr  +, fruiting Aug.  +
Crataegus phaenopyrum +
Flowering Jun  +, fruiting Sep–Nov.  +
Crataegus phippsii +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus pinetorum +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus populnea +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus prona +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus pruinosa var. dissona +
Flowering Apr–May  +, fruiting Sep–Nov.  +
Crataegus pruinosa var. magnifolia +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus pruinosa var. parvula +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus pruinosa var. pruinosa +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus pruinosa var. rugosa +
Flowering Apr–May  +, fruiting Sep–Nov.  +
Crataegus pruinosa var. virella +
Flowering Apr–May  +, fruiting Sep–Nov.  +
Crataegus pulcherrima +
Flowering mid Apr  +, fruiting Sep–Oct.  +
Crataegus punctata +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus purpurella +
Flowering late May–early Jun  +, fruiting Aug–Sep.  +
Crataegus quaesita +
Flowering Mar–Apr  +, fruiting Jul–Aug.  +
Crataegus reverchonii var. mohrii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus reverchonii var. palmeri +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus reverchonii var. reverchonii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus rivularis +
Flowering mid May–early Jun  +, fruiting Aug–Sep.  +
Crataegus rivuloadamensis +
Flowering late May–early Jun  +, fruiting Aug–Sep.  +
Crataegus rivulopugnensis +
Flowering late May–early Jun  +, fruiting Aug–Sep.  +
Crataegus roribacca +
Flowering Apr  +, fruiting Sep.  +
Crataegus rubella +
Flowering late Apr–early May  +, fruiting Sep–Oct.  +
Crataegus rubribracteolata +
Flowering late May  +, fruiting late Aug–Sep.  +
Crataegus saligna +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus sargentii +
Flowering late Mar–mid Apr  +, fruiting Sep–Nov.  +
Crataegus scabrida var. asperifolia +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus scabrida var. cyclophylla +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus scabrida var. egglestonii +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus scabrida var. scabrida +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus schizophylla +
Flowering May–Jun  +, fruiting Oct.  +
Crataegus schuettei var. cuneata +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus schuettei var. ferrissii +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus schuettei var. gigantea +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus schuettei var. schuettei +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus segnis +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus senta +
Flowering Apr–early May  +, fruiting Aug–Sep.  +
Crataegus sheila-phippsiae var. saskatchewanensis +
Flowering May–Jun  +, fruiting Aug–Sep.  +
Crataegus sheila-phippsiae var. sheila-phippsiae +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus sheridana +
Flowering May–Jun  +, fruiting Sep.  +
Crataegus shuswapensis +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus sororia +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus spathulata +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus spes-aestatum +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus stolonifera +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus stonei +
Flowering late May–early Jun  +, fruiting Sep–Oct.  +
Crataegus submollis +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus suborbiculata +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus succulenta var. gemmosa +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus succulenta var. michiganensis +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus succulenta var. neofluvialis +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus succulenta var. pisifera +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus succulenta var. succulenta +
Flowering Apr–Jun  +, fruiting Sep–Oct.  +
Crataegus tecta +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus teres +
Flowering Mar  +, fruiting Aug–Sep.  +
Crataegus texana var. dasyphylla +
Flowering Mar–Apr  +, fruiting Sep–Nov.  +
Crataegus texana var. texana +
Flowering Mar–Apr  +, fruiting Sep–Nov.  +
Crataegus tracyi +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus triflora +
Flowering late Apr–early May  +, fruiting Sep–Nov.  +
Crataegus turnerorum +
Flowers Apr  +, fruiting Sep–Oct.  +
Crataegus uniflora +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Crataegus ursopedensis +
Flowering May–Jun  +, fruiting not recorded.  +
Crataegus venusta +
Flowering early–mid Apr  +, fruiting Sep–Nov.  +
Crataegus viridis var. glabriuscula +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus viridis var. lanceolata +
Flowering Apr  +, fruiting Sep–Nov.  +
Crataegus viridis var. nitens +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus viridis var. ovata +
Flowering early May  +, fruiting Oct.  +
Crataegus viridis var. velutina +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus viridis var. viridis +
Flowering Apr–May  +, fruiting Sep–Nov.  +
Crataegus visenda +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus wattiana var. wattiana +
Flowering Apr–Jun  +, fruiting Sep–Oct.  +
Crataegus williamsii +
Flowering May–Jun  +, fruiting Sep–Oct.  +
Crataegus wootoniana +
Flowering May  +, fruiting Sep.  +
Crataegus ×atrorubens +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus ×bicknellii +
Flowering Jun  +, fruiting Sep–Oct.  +
Crataegus ×coleae +
Flowering May  +, fruiting late Sep.  +
Crataegus ×collicola +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ×disperma +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ×dispessa +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ×fretalis +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ×incaedua +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ×kelloggii +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus ×latebrosa +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus ×lucorum +
Flowering May  +, fruiting Sep–Oct.  +
Crataegus ×rufula +
Flowering Feb–Mar  +, fruiting May–Jun.  +
Crataegus ×sicca nothovar. glabrifolia +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus ×sicca nothovar. sicca +
Flowering Apr  +, fruiting Sep–Oct.  +
Crataegus ×vailiae +
Flowers Apr–May  +, fruiting Sep–Oct.  +
Crepis acuminata +
Flowering May–Aug.  +
Crepis atribarba +
Flowering May–Jul.  +
Crepis bakeri subsp. bakeri +
Flowering May–Jul.  +
Crepis bakeri subsp. cusickii +
Flowering Jun–Jul.  +
Crepis bakeri subsp. idahoensis +
Flowering May–Jul.  +
Crepis barbigera +
Flowering May–Jul.  +
Crepis biennis +
Flowering Jun–Aug.  +
Crepis bursifolia +
Flowering Apr–Sep.  +
Crepis capillaris +
Flowering May–Nov.  +
Crepis elegans +
Flowering Jun–Sep.  +
Crepis foetida +
Flowering Apr–Sep.  +
Crepis intermedia +
Flowering May–Jul.  +
Crepis modocensis subsp. glareosa +
Flowering May–Jul.  +
Crepis modocensis subsp. modocensis +
Flowering May–Jul.  +
Crepis modocensis subsp. rostrata +
Flowering May–Jul.  +
Crepis modocensis subsp. subacaulis +
Flowering May–Jul.  +
Crepis monticola +
Flowering May–Jul.  +
Crepis nana +
Flowering May–Sep.  +
Crepis nicaeënsis +
Flowering May–Aug.  +
Crepis occidentalis subsp. conjuncta +
Flowering Jun–Jul.  +
Crepis occidentalis subsp. costata +
Flowering Jun–Jul.  +
Crepis occidentalis subsp. occidentalis +
Flowering May–Jun.  +
Crepis occidentalis subsp. pumila +
Flowering Jun–Jul.  +
Crepis pannonica +
Flowering Jun–Aug.  +
Crepis pleurocarpa +
Flowering Jun–Aug.  +
Crepis pulchra +
Flowering Apr–Aug.  +
Crepis rubra +
Flowering Apr–Jun.  +
Crepis runcinata subsp. andersonii +
Flowering May–Jul.  +
Crepis runcinata subsp. barberi +
Flowering Jun–Sep.  +
Crepis runcinata subsp. glauca +
Flowering May–Aug.  +
Crepis runcinata subsp. hallii +
Flowering Jul–Aug.  +
Crepis runcinata subsp. hispidulosa +
Flowering Jun–Jul.  +
Crepis runcinata subsp. imbricata +
Flowering May–Jun.  +
Crepis runcinata subsp. runcinata +
Flowering Jun–Jul.  +
Crepis setosa +
Flowering May–Nov.  +
Crepis tectorum +
Flowering May–Sep.  +
Crepis vesicaria +
Flowering Feb–Oct.  +
Crepis zacintha +
Flowering Jun–Jul.  +
Cressa nudicaulis +
Flowering Apr–Jun(–Sep).  +
Cressa truxillensis +
Flowering Apr–Nov.  +
Crinum americanum var. americanum +
Flowering late winter–autumn (all year in Fla).  +
Crinum americanum var. traubii +
Flowering summer–autumn.  +
Crinum asiaticum +
Flowering summer–fall.  +
Crinum bulbispermum +
Flowering spring–summer.  +
Crinum zeylanicum +
Flowering late spring–summer.  +
Crocanthemum aldersonii +
Flowering Mar–Jun.  +
Crocanthemum arenicola +
Flowering Mar–Apr.  +
Crocanthemum bicknellii +
Flowering Jun–Jul.  +
Crocanthemum canadense +
Flowering late Mar–Jul(–Aug).  +
Crocanthemum carolinianum +
Flowering Mar–May.  +
Crocanthemum corymbosum +
Flowering late Feb–Apr.  +
Crocanthemum dumosum +
Flowering late May–Jun.  +
Crocanthemum georgianum +
Flowering Apr–Jun.  +
Crocanthemum glomeratum +
Flowering Jun–Aug [throughout the year].  +
Crocanthemum greenei +
Flowering Apr–May.  +
Crocanthemum nashii +
Flowering Mar–Jun.  +
Crocanthemum propinquum +
Flowering May–early Jul.  +
Crocanthemum rosmarinifolium +
Flowering May–Jul.  +
Crocanthemum scoparium var. scoparium +
Flowering Mar–Jul.  +
Crocanthemum scoparium var. vulgare +
Flowering Mar–Jul.  +
Crocanthemum suffrutescens +
Flowering Apr–Jun.  +
Crocidium multicaule +
Flowering Feb–Jun.  +
Crocosmia ×crocosmiiflora +
Flowering mainly Jul–Aug.  +
Croomia pauciflora +
Flowering spring.  +
Croptilon divaricatum +
Flowering (Jul–)Aug–Oct(–Nov).  +
Croptilon hookerianum var. graniticum +
Flowering Aug–Oct(–Dec).  +
Croptilon hookerianum var. hookerianum +
Flowering Jul–Oct.  +
Croptilon hookerianum var. validum +
Flowering (Jun–)Jul–Oct.  +
Croptilon rigidifolium +
Flowering Sep–Nov(–Dec).  +
Crossidium aberrans +
Capsule mature Jan–Jun(-Aug).  +
Crossidium crassinervium var. crassinervium +
Capsule mature Dec–Jul.  +
Crossidium seriatum +
Capsules mature Jan–Jul.  +
Crossidium squamiferum var. pottioideum +
Capsule mature May–Aug(-Dec).  +
Crossidium squamiferum var. squamiferum +
Capsules mature (Aug-)Dec–Mar.  +
Crossopetalum ilicifolium +
Flowering year-round  +, fruiting year-round.  +
Crossopetalum rhacoma +
Flowering year-round  +, fruiting year-round.  +
Crossosoma bigelovii +
Flowering Jan–May.  +
Crossosoma californicum +
Flowering Feb–May.  +
Croton alabamensis var. alabamensis +
Flowering mostly late Feb–early Apr  +, fruiting mostly May–Jun.  +
Croton alabamensis var. texensis +
Flowering mostly late Feb–early Apr  +, fruiting mostly May–Jun.  +
Croton argenteus +
Flowering Jun–Dec.  +
Croton argyranthemus +
Flowering Mar–Sep.  +
Croton californicus +
Flowering Feb–Oct.  +
Croton capitatus +
Flowering Jun–Oct.  +
Croton ciliatoglandulifer +
Flowering Oct–Dec.  +
Croton cortesianus +
Flowering Feb–Oct, possibly year-round.  +
Croton coryi +
Flowering May–Nov.  +
Croton dioicus +
Flowering Mar–Nov.  +
Croton elliottii +
Flowering Jul–Sep.  +
Croton fruticulosus +
Flowering May–Dec.  +
Croton glandulosus var. arenicola +
Flowering year-round.  +
Croton glandulosus var. floridanus +
Flowering year-round.  +
Croton glandulosus var. lindheimeri +
Flowering May–Dec.  +
Croton glandulosus var. pubentissimus +
Flowering May–Nov.  +
Croton glandulosus var. septentrionalis +
Flowering May–Nov.  +
Croton heptalon +
Flowering May–Dec.  +
Croton humilis +
Flowering year-round.  +
Croton incanus +
Flowering Mar–Nov.  +
Croton leucophyllus var. leucophyllus +
Flowering Jun–Nov.  +
Croton lindheimeri +
Flowering May–Dec.  +
Croton lindheimerianus var. lindheimerianus +
Flowering May–Nov.  +
Croton lindheimerianus var. tharpii +
Flowering Jul–Oct.  +
Croton linearis +
Flowering year-round.  +
Croton michauxii var. elliptica +
Flowering Jun–Oct.  +
Croton michauxii var. michauxii +
Flowering Jun–Oct.  +
Croton monanthogynus +
Flowering May–Nov.  +
Croton parksii +
Flowering Jun–Dec.  +
Croton pottsii var. pottsii +
Flowering May–Oct.  +
Croton pottsii var. thermophilus +
Flowering Jul–Oct.  +
Croton punctatus +
Flowering year-round.  +
Croton sancti-lazari +
Flowering Oct–Nov.  +
Croton setigerus +
Flowering Jun–Oct.  +
Croton soliman +
Flowering May–Jul.  +
Croton sonorae +
Flowering Jul–Sep.  +
Croton suaveolens +
Flowering Apr–Nov.  +
Croton texensis +
Flowering Jun–Nov.  +
Croton wigginsii +
Flowering Feb–May.  +
Crumia latifolia +
Sporophytes mature spring–summer (May, Jun, Jul).  +
Crupina vulgaris +
Flowering spring–summer (Jun–Aug).  +
Cryphaea filiformis +
Capsules mature Mar–Apr.  +
Cryphaea glomerata +
Capsules mature Sep–Jun.  +
Cryphaea nervosa +
Capsules mature Dec–Apr.  +
Cryphaea ravenelii +
Capsules mature Apr–May.  +
Cryptostegia grandiflora +
Flowering and fruiting year-round, mostly in summer.  +
Cryptostegia madagascariensis +
Flowering and fruiting year-round, mostly in summer.  +
Ctenidium molluscum +
Capsules mature summer.  +
Ctenidium schofieldii +
Capsule maturity unknown.  +
Ctenolepis cerasiformis +
Flowering Aug–Sep.  +
Cucumis anguria var. anguria +
Flowering Jul–Oct.  +
Cucumis anguria var. longaculeatus +
Flowering Jul–Oct.  +
Cucumis dipsaceus +
Flowering Jul–Sep.  +
Cucumis melo subsp. agrestis +
Flowering Jul–Oct(–Nov).  +
Cucumis melo subsp. melo +
Flowering Jul–Oct.  +
Cucumis metuliferus +
Flowering Jul–Sep.  +
Cucumis myriocarpus +
Flowering Aug–Nov.  +
Cucumis sativus var. sativus +
Flowering Aug–Nov.  +
Cucurbita digitata +
Flowering (Feb, Apr–)May–Sep(–Oct).  +
Cucurbita ficifolia +
Flowering Jul–Oct.  +
Cucurbita foetidissima +
Flowering May–Aug.  +
Cucurbita maxima +
Flowering Jun–Oct.  +
Cucurbita melopepo var. melopepo +
Flowering Jun–Oct.  +
Cucurbita melopepo var. ozarkana +
Flowering Jun–Oct.  +
Cucurbita melopepo var. texana +
Flowering Jun–Nov.  +
Cucurbita moschata +
Flowering May–Oct.  +
Cucurbita okeechobeensis subsp. okeechobeensis +
Flowering Mar–Nov.  +
Cucurbita palmata +
Flowering (Feb–)Apr–Sep(–Oct).  +
Cucurbita pepo subsp. pepo +
Flowering Jun–Oct.  +
Cuniculotinus gramineus +
Flowering late summer–fall.  +
Cuphea aspera +
Flowering early–late summer.  +
Cuphea carthagenensis +
Flowering late spring–fall.  +
Cuphea glutinosa +
Flowering spring–summer.  +
Cuphea strigulosa +
Flowering summer.  +
Cuphea viscosissima +
Flowering summer–fall.  +
Cuphea wrightii +
Flowering mid–late summer.  +
Curcuma zedoaria +
Flowering spring (May).  +
Cuscuta americana +
Flowering Sep–Mar.  +
Cuscuta approximata var. approximata +
Flowering May–Sep.  +
Cuscuta azteca +
Flowering Jul–Nov.  +
Cuscuta boldinghii +
Flowering Jul–Nov.  +
Cuscuta brachycalyx +
Flowering Jun–Sep.  +
Cuscuta californica var. apiculata +
Flowering Mar–Aug.  +
Cuscuta californica var. californica +
Flowering Mar–Aug(–Sep).  +
Cuscuta californica var. papillosa +
Flowering Dec–Sep.  +
Cuscuta campestris +
Flowering May–Nov.  +
Cuscuta cephalanthi +
Flowering Jun–Oct.  +
Cuscuta chinensis var. applanata +
Flowering Jul–Oct.  +
Cuscuta compacta +
Flowering late Jul–Nov.  +
Cuscuta coryli +
Flowering Aug–Nov.  +
Cuscuta cuspidata +
Flowering Jun–Oct.  +
Cuscuta dentatasquamata +
Flowering Jul–Oct.  +
Cuscuta denticulata +
Flowering Mar–Oct(–Dec).  +
Cuscuta draconella +
Flowering Aug–Sep.  +
Cuscuta epilinum +
Flowering Jun–Jul.  +
Cuscuta epithymum var. epithymum +
Flowering Jul–Oct.  +
Cuscuta erosa +
Flowering Aug–Oct.  +
Cuscuta europaea +
Flowering Jul–Sep.  +
Cuscuta exaltata +
Flowering May–Oct.  +
Cuscuta glabrior +
Flowering Apr–Sep.  +
Cuscuta glomerata +
Flowering Jul–Oct.  +
Cuscuta gronovii var. calyptrata +
Flowering late Aug–Oct.  +
Cuscuta gronovii var. gronovii +
Flowering Jun–Nov.  +
Cuscuta gronovii var. latiflora +
Flowering Jul–Oct.  +
Cuscuta harperi +
Flowering Sep–Nov.  +
Cuscuta howelliana +
Flowering Aug–Sep.  +
Cuscuta indecora var. attenuata +
Flowering late Aug–Oct.  +
Cuscuta indecora var. indecora +
Flowering Apr–Nov.  +
Cuscuta indecora var. longisepala +
Flowering Jun–Sep.  +
Cuscuta japonica var. formosana +
Flowering Aug–Sep.  +
Cuscuta japonica var. japonica +
Flowering Aug–Sep.  +
Cuscuta jepsonii +
Flowering Jul–Sep.  +
Cuscuta legitima +
Flowering Aug–Nov.  +
Cuscuta leptantha +
Flowering Feb–Nov.  +
Cuscuta liliputana +
Flowering Jul–Feb.  +
Cuscuta mitriformis +
Flowering Jul–Sep.  +
Cuscuta nevadensis +
Flowering May–Jul.  +
Cuscuta obtusiflora var. glandulosa +
Flowering Jun–Sep(–Oct).  +
Cuscuta occidentalis +
Flowering Mar–Sep.  +
Cuscuta odontolepis +
Flowering Aug–Oct.  +
Cuscuta pacifica var. pacifica +
Flowering Jun–Oct.  +
Cuscuta pacifica var. papillata +
Flowering Jul–Oct.  +
Cuscuta pentagona +
Flowering Apr–Nov.  +
Cuscuta plattensis +
Flowering Aug–Sep.  +
Cuscuta polygonorum +
Flowering Jul–Oct.  +
Cuscuta rostrata +
Flowering Jul–Sep.  +
Cuscuta runyonii +
Flowering Mar–Dec.  +
Cuscuta salina +
Flowering Mar–Nov.  +
Cuscuta squamata +
Flowering Mar–Oct.  +
Cuscuta suaveolens +
Flowering Jul–Oct.  +
Cuscuta subinclusa +
Flowering Apr–Oct.  +
Cuscuta suksdorfii +
Flowering Jul–Sep.  +
Cuscuta tuberculata +
Flowering Aug–Nov.  +
Cuscuta umbellata var. umbellata +
Flowering Apr–Dec.  +
Cuscuta umbrosa +
Flowering Jul–Oct.  +
Cuscuta warneri +
Flowering Jun–Sep.  +
Cusickiella douglasii +
Flowering Apr–Aug.  +
Cusickiella quadricostata +
Flowering May–Jun.  +
Cyanthillium cinereum +
Flowering year-round.  +
Cyclachaena xanthiifolia +
Flowering Jul–Oct.  +
Cycladenia humilis var. humilis +
Flowering summer  +, fruiting summer.  +
Cycladenia humilis var. jonesii +
Flowering summer  +, fruiting summer.  +
Cycladenia humilis var. venusta +
Flowering summer  +, fruiting summer.  +
Cyclanthera dissecta +
Flowering Sep–Nov.  +
Cyclanthera gracillima +
Flowering Aug–Oct.  +
Cyclanthera naudiniana +
Flowering May–Oct.  +
Cyclanthera stenura +
Flowering (May–)Aug–Oct.  +
Cyclodictyon varians +
Capsules mature fall–winter.  +
Cycloloma atriplicifolium +
Flowering late summer–fall.  +
Cyclopogon cranichoides +
Flowering Feb–Mar.  +
Cyclopogon elatus +
Flowering Feb–Mar.  +
Cydonia oblonga +
Flowering Apr–May  +, fruiting Sep–Oct.  +
Cylindropuntia abyssi +
Flowering spring–early summer (Mar–Jun).  +
Cylindropuntia acanthocarpa var. acanthocarpa +
Flowering spring (May).  +
Cylindropuntia acanthocarpa var. coloradensis +
Flowering spring–early summer (Mar–Jun).  +
Cylindropuntia acanthocarpa var. major +
Flowering spring (Mar–Jun).  +
Cylindropuntia acanthocarpa var. thornberi +
Flowering mid-late spring (Apr–Jun).  +
Cylindropuntia arbuscula +
Flowering spring (Apr–Jun).  +
Cylindropuntia bigelovii var. bigelovii +
Flowering spring–fall (Mar–Jun, Sep).  +
Cylindropuntia californica var. californica +
Flowering spring (Apr-early Jun).  +
Cylindropuntia californica var. parkeri +
Flowering spring (Apr–Jul).  +
Cylindropuntia davisii +
Flowering late spring (May–Jun).  +
Cylindropuntia echinocarpa +
Flowering spring (Mar–Jun).  +
Cylindropuntia fulgida var. fulgida +
Flowering spring–fall (Apr–Sep).  +
Cylindropuntia fulgida var. mamillata +
Flowering spring–fall (Apr–Aug, Oct).  +
Cylindropuntia ganderi +
Flowering spring (Mar–May).  +
Cylindropuntia imbricata var. argentea +
Flowering spring (Apr).  +
Cylindropuntia imbricata var. imbricata +
Flowering spring–summer (May–Aug).  +
Cylindropuntia kleiniae +
Flowering late spring–early summer (May–Jun).  +
Cylindropuntia leptocaulis +
Flowering spring–early summer, sometimes fall (Mar–Aug, Oct).  +
Cylindropuntia munzii +
Flowering spring (Mar–May).  +
Cylindropuntia prolifera +
Flowering spring (Apr–Jul).  +
Cylindropuntia ramosissima +
Flowering spring–summer (Apr–Aug).  +
Cylindropuntia spinosior +
Flowering spring–early summer (Apr–Aug).  +
Cylindropuntia tunicata +
Flowering late spring (May–Jun).  +
Cylindropuntia versicolor +
Flowering spring (Apr–Jun).  +
Cylindropuntia whipplei +
Flowering late spring–early summer (May–Jul).  +
Cylindropuntia wolfii +
Flowering spring (Mar–May).  +
Cylindropuntia ×kelvinensis +
Flowering spring (Apr–Jun).  +
Cylindropuntia ×tetracantha +
Flowering spring (Apr–May).  +
Cymbalaria muralis subsp. muralis +
Flowering May–Oct.  +
Cymophyllus fraserianus +
Fruiting early summer (May–Jun).  +
Cynanchum laeve +
Flowering Apr–Nov  +, fruiting Jul–Dec.  +
Cynanchum ligulatum +
Flowering Jul–Aug  +, fruiting Sep–Oct.  +
Cynanchum unifarium +
Flowering Apr–Oct  +, fruiting Jun–Jan.  +
Cynara cardunculus subsp. cardunculus +
Flowering spring–summer (Apr–Jul).  +
Cynara cardunculus subsp. flavescens +
Flowering spring–summer (Apr–Jul).  +
Cynodontium alpestre +
Capsules mature summer.  +
Cynodontium glaucescens +
Capsules mature summer.  +
Cynodontium gracilescens +
Capsules mature summer.  +
Cynodontium jenneri +
Capsules mature summer.  +
Cynodontium polycarpon +
Capsules mature summer.  +
Cynodontium schisti +
Capsules mature spring.  +
Cynodontium strumiferum +
Capsules mature summer.  +
Cynodontium strumulosum +
Capsules mature summer.  +
Cynodontium tenellum +
Capsules mature summer.  +
Cynophalla flexuosa +
Flowering spring–late summer.  +
Cyperus acuminatus +
Fruiting summer–fall (Jul–Oct).  +
Cyperus aggregatus +
Fruiting mid summer–fall (Jul–Oct).  +
Cyperus alopecuroides +
Fruiting summer.  +
Cyperus amabilis +
Fruiting summer.  +
Cyperus articulatus +
Fruiting summer.  +
Cyperus bipartitus +
Fruiting summer.  +
Cyperus cephalanthus +
Fruiting summer.  +
Cyperus compressus +
Fruiting summer–early fall.  +
Cyperus croceus +
Fruiting summer–early fall.  +
Cyperus cuspidatus +
Fruiting summer.  +
Cyperus dentatus +
Fruiting summer.  +
Cyperus dentoniae +
Fruiting mid summer–fall (Jul–Sep).  +
Cyperus diandrus +
Fruiting summer.  +
Cyperus difformis +
Fruiting summer.  +
Cyperus digitatus +
Fruiting summer.  +
Cyperus dipsaceus +
Fruiting late summer.  +
Cyperus distans +
Fruiting summer.  +
Cyperus distinctus +
Fruiting summer.  +
Cyperus drummondii +
Fruiting late spring–summer.  +
Cyperus echinatus +
Fruiting summer–early fall.  +
Cyperus elegans +
Fruiting summer.  +
Cyperus entrerianus +
Fruiting summer.  +
Cyperus eragrostis +
Fruiting summer.  +
Cyperus erythrorhizos +
Fruiting summer.  +
Cyperus esculentus var. heermannii +
Fruiting summer.  +
Cyperus esculentus var. leptostachyus +
Fruiting summer.  +
Cyperus esculentus var. macrostachyus +
Fruiting summer.  +
Cyperus fendlerianus +
Fruiting summer.  +
Cyperus filicinus +
Fruiting summer.  +
Cyperus filiculmis +
Fruiting summer.  +
Cyperus filiformis +
Fruiting spring–fall.  +
Cyperus flavescens +
Fruiting summer–early fall.  +
Cyperus flavicomus +
Fruiting summer–early fall.  +
Cyperus floribundus +
Fruiting mid summer–early fall (Jul–Sep).  +
Cyperus fugax +
Fruiting early summer.  +
Cyperus fuligineus +
Fruiting spring–summer.  +
Cyperus fuscus +
Fruiting summer.  +
Cyperus giganteus +
Fruiting summer.  +
Cyperus gracilis +
Fruiting summer–early fall.  +
Cyperus granitophilus +
Fruiting summer.  +
Cyperus grayi +
Fruiting summer.  +
Cyperus grayoides +
Fruiting summer.  +
Cyperus haspan +
Fruiting summer.  +
Cyperus hermaphroditus +
Fruiting summer–fall.  +
Cyperus houghtonii +
Fruiting summer.  +
Cyperus hypopitys +
Fruiting late summer–early fall.  +
Cyperus hystricinus +
Fruiting late summer–early fall (Jul–Sep).  +
Cyperus involucratus +
Fruiting early summer–fall.  +
Cyperus iria +
Fruiting summer–fall (Jul–Oct).  +
Cyperus laevigatus +
Fruiting summer.  +
Cyperus lancastriensis +
Fruiting summer (Jul–Aug).  +
Cyperus lanceolatus +
Fruiting summer.  +
Cyperus lecontei +
Fruiting summer.  +
Cyperus lentiginosus +
Fruiting spring–summer.  +
Cyperus ligularis +
Fruiting throughout the year.  +
Cyperus lupulinus subsp. lupulinus +
Fruiting summer  +
Cyperus lupulinus subsp. macilentus +
Fruiting summer  +
Cyperus manimae var. asperrimus +
Fruiting summer–early fall.  +
Cyperus melanostachyus +
Fruiting summer.  +
Cyperus microiria +
Fruiting summer.  +
Cyperus mutisii +
Fruiting summer–fall (Jun–Nov).  +
Cyperus ochraceus +
Fruiting summer.  +
Cyperus odoratus +
Fruiting summer–early fall.  +
Cyperus onerosus +
Fruiting early summer (May–Jun).  +
Cyperus ovatus +
Fruiting spring–summer.  +
Cyperus owanii +
Fruiting spring–fall.  +
Cyperus oxylepis +
Fruiting summer.  +
Cyperus pallidicolor +
Fruiting summer.  +
Cyperus papyrus +
Fruiting summer.  +
Cyperus parishii +
Fruiting summer.  +
Cyperus pilosus +
Fruiting summer.  +
Cyperus planifolius +
Fruiting throughout the year.  +
Cyperus plukenetii +
Fruiting summer (Jul–Aug).  +
Cyperus polystachyos +
Fruiting summer–early fall.  +
Cyperus prolifer +
Fruiting summer.  +
Cyperus prolixus +
Fruiting summer.  +
Cyperus pseudothyrsiflorus +
Fruiting mid summer–early fall (Jul–Sep).  +
Cyperus pseudovegetus +
Fruiting summer.  +
Cyperus pumilus +
Fruiting spring–summer.  +
Cyperus reflexus +
Fruiting late spring–fall (May–Oct).  +
Cyperus refractus +
Fruiting summer (Jul–Aug).  +
Cyperus retroflexus +
Fruiting mid summer–early fall (Jul–Sep).  +
Cyperus retrofractus +
Fruiting summer.  +
Cyperus retrorsus +
Fruiting summer (Jun–Aug).  +
Cyperus rotundus +
Fruiting summer–fall.  +
Cyperus sanguinolentus +
Fruiting late summer–fall.  +
Cyperus schweinitzii +
Fruiting late spring–early summer.  +
Cyperus serotinus +
Fruiting summer.  +
Cyperus seslerioides +
Fruiting summer.  +
Cyperus setigerus +
Fruiting summer.  +
Cyperus spectabilis +
Fruiting summer.  +
Cyperus sphacelatus +
Fruiting summer.  +
Cyperus sphaerolepis +
Fruiting summer.  +
Cyperus squarrosus +
Fruiting summer.  +
Cyperus strigosus +
Fruiting summer.  +
Cyperus surinamensis +
Fruiting late spring–early fall.  +
Cyperus tetragonus +
Fruiting summer–fall (Jun–Nov).  +
Cyperus thyrsiflorus +
Fruiting summer.  +
Cyperus virens +
Fruiting spring–fall.  +
Cyphomeris crassifolia +
Flowering late spring–fall.  +
Cyphomeris gypsophiloides +
Flowering mid summer–fall.  +
Cypripedium acaule +
Flowering Apr–Jul.  +
Cypripedium arietinum +
Flowering May–Jun.  +
Cypripedium californicum +
Flowering May–Jun.  +
Cypripedium candidum +
Flowering Apr–Jul.  +
Cypripedium fasciculatum +
Flowering Apr–Aug.  +
Cypripedium guttatum +
Flowering Jun–Jul.  +
Cypripedium kentuckiense +
Flowering Apr–Jun.  +
Cypripedium montanum +
Flowering Feb–Sep.  +
Cypripedium parviflorum var. makasin +
Flowering May–Aug.  +
Cypripedium parviflorum var. parviflorum +
Flowering Apr–Jun.  +
Cypripedium parviflorum var. pubescens +
Flowering Apr–Aug.  +
Cypripedium passerinum +
Flowering Jun–Jul.  +
Cypripedium reginae +
Flowering May–Aug.  +
Cypripedium yatabeanum +
Flowering Jun–Aug.  +
Cypselea humifusa +
Flowering summer–fall.  +
Cyrilla racemiflora +
Flowering May–Jul, sometimes again Sep–Oct.  +
Cyrto-hypnum involvens +
Capsules mature winter [Nov–Dec(-Mar)].  +
Cyrto-hypnum minutulum +
Capsules mature early spring–fall [Feb–Aug(-Oct)].  +
Cyrto-hypnum pygmaeum +
Capsules mature summer (Jul–Sep).  +
Cyrto-hypnum schistocalyx +
Capsule maturity unknown.  +
Cyrtomnium hymenophylloides +
Capsules mature summer.  +
Cyrtomnium hymenophyllum +
Capsules mature summer.  +
Cyrtopodium polyphyllum +
Flowering winter.  +
Cyrtopodium punctatum +
Flowering winter–early spring.  +
Cystopteris bulbifera +
Sporulating summer–fall.  +
Cystopteris fragilis +
Sporulating summer–fall.  +
Cystopteris laurentiana +
Sporulating summer–fall.  +
Cystopteris montana +
Sporulating summer–fall.  +
Cystopteris protrusa +
Sporulating spring–summer.  +
Cystopteris reevesiana +
Sporulating summer–fall.  +
Cystopteris tennesseensis +
Sporulating summer–fall.  +
Cystopteris tenuis +
Sporulating summer–fall.  +
Cystopteris utahensis +
Sporulating summer–fall.  +
D
Dactylorhiza aristata +
Flowering late spring–mid summer.  +
Dactylorhiza majalis var. junialis +
Flowering late Jun (Ont)–late Jul (Nfld).  +
Dalechampia scandens +
Flowering and fruiting year-round, especially at end of summer/rainy season.  +
Daltonia splachnoides +
Capsules mature summer.  +
Damasonium californicum +
Flowering late summer.  +
Daphne laureola +
Flowering late winter–early spring (Feb–Apr).  +
Daphne mezereum +
Flowering summer (Jun–Aug).  +
Darlingtonia californica +
Flowering mid Apr–Jul.  +
Darmera peltata +
Flowering Apr–Jul.  +
Dasiphora fruticosa +
Flowering summer.  +
Dasistoma macrophyllum +
Flowering Jun–Sep.  +
Dasylirion leiophyllum +
Flowering mainly Jun–Jul.  +
Dasylirion texanum +
Flowering May–Jul.  +
Dasylirion wheeleri +
Flowering mostly late May–Jun.  +
Datisca glomerata +
Flowering late Apr–Aug.  +
Datura ceratocaula +
Flowering Jul–Sep.  +
Datura discolor +
Flowering Mar–Oct.  +
Datura ferox +
Flowering Jun–Sep.  +
Datura innoxia +
Flowering Jul–Oct.  +
Datura metel +
Flowering Jun–Sep.  +
Datura quercifolia +
Flowering Jul–Oct.  +
Datura stramonium +
Flowering summer.  +
Datura wrightii +
Flowering Jun–Oct.  +
Decodon verticillatus +
Flowering summer–fall.  +
Decumaria barbara +
Flowering Apr–Jun  +, fruiting Jul–Oct.  +
Dedeckera eurekensis +
Flowering Jun–Oct.  +
Deeringothamnus pulchellus +
Flowering late winter–spring, all year on disturbance.  +
Deeringothamnus rugelii +
Flowering spring, all year as disturbance reaction.  +
Deinandra arida +
Flowering Apr–Nov.  +
Deinandra bacigalupii +
Flowering Jun–Oct.  +
Deinandra clementina +
Flowering Mar–Dec.  +
Deinandra conjugens +
Flowering Apr–Jun.  +
Deinandra corymbosa +
Flowering Mar–Nov.  +
Deinandra fasciculata +
Flowering Apr–Sep.  +
Deinandra floribunda +
Flowering Aug–Nov.  +
Deinandra halliana +
Flowering Apr–May.  +
Deinandra increscens subsp. increscens +
Flowering Apr–Nov.  +
Deinandra increscens subsp. villosa +
Flowering Jun–Sep.  +
Deinandra kelloggii +
Flowering Mar–Nov.  +
Deinandra lobbii +
Flowering May–Dec.  +
Deinandra minthornii +
Flowering Jun–Nov.  +
Deinandra mohavensis +
Flowering (May–)Jul–Oct(–Jan).  +
Deinandra pallida +
Flowering Mar–Jul.  +
Deinandra paniculata +
Flowering May–Nov.  +
Deinandra pentactis +
Flowering Apr–Oct.  +
Deiregyne confusa +
Flowering May–Jul.  +
Delairea odorata +
Flowering year round, mostly Nov–Feb.  +
Delosperma litorale +
Flowering late spring–fall.  +
Delphinium alabamicum +
Flowering mid-late spring.  +
Delphinium alpestre +
Flowering mid-late summer.  +
Delphinium andersonii +
Flowering late spring–early summer.  +
Delphinium andesicola +
Flowering summer–early fall.  +
Delphinium antoninum +
Flowering late spring–early summer.  +
Delphinium bakeri +
Flowering spring.  +
Delphinium barbeyi +
Flowering summer.  +
Delphinium basalticum +
Flowering spring (-early summer).  +
Delphinium bicolor subsp. bicolor +
Flowering late spring–early summer.  +
Delphinium bicolor subsp. calcicola +
Flowering late spring–early summer.  +
Delphinium brachycentrum +
Flowering summer.  +
Delphinium californicum subsp. californicum +
Flowering late spring.  +
Delphinium californicum subsp. interius +
Flowering late spring.  +
Delphinium cardinale +
Flowering spring–early summer.  +
Delphinium carolinianum subsp. calciphilum +
Flowering spring.  +
Delphinium carolinianum subsp. carolinianum +
Flowering late winter–early summer.  +
Delphinium carolinianum subsp. vimineum +
Flowering late winter–early summer.  +
Delphinium carolinianum subsp. virescens +
Flowering late winter–early summer.  +
Delphinium decorum subsp. decorum +
Flowering early-mid spring.  +
Delphinium decorum subsp. tracyi +
Flowering mid-late spring.  +
Delphinium depauperatum +
Flowering summer.  +
Delphinium distichum +
Flowering late spring–early summer.  +
Delphinium elatum +
Flowering summer, more than 8 weeks after snowmelt.  +
Delphinium exaltatum +
Flowering summer.  +
Delphinium geraniifolium +
Flowering summer.  +
Delphinium geyeri +
Flowering late spring–early summer.  +
Delphinium glareosum +
Flowering summer.  +
Delphinium glaucescens +
Flowering summer.  +
Delphinium glaucum +
Flowering summer.  +
Delphinium gracilentum +
Flowering spring–early summer.  +
Delphinium gypsophilum subsp. gypsophilum +
Flowering spring.  +
Delphinium gypsophilum subsp. parviflorum +
Flowering spring.  +
Delphinium hansenii subsp. ewanianum +
Flowering early-mid spring.  +
Delphinium hansenii subsp. hansenii +
Flowering spring(-early summer).  +
Delphinium hansenii subsp. kernense +
Flowering spring.  +
Delphinium hesperium subsp. cuyamacae +
Flowering early summer.  +
Delphinium hesperium subsp. hesperium +
Flowering mid-late spring.  +
Delphinium hesperium subsp. pallescens +
Flowering spring.  +
Delphinium hutchinsoniae +
Flowering spring.  +
Delphinium inopinum +
Flowering summer.  +
Delphinium lineapetalum +
Flowering spring.  +
Delphinium luteum +
Flowering late winter-mid spring.  +
Delphinium madrense +
Flowering spring–early summer.  +
Delphinium menziesii subsp. menziesii +
Flowering spring.  +
Delphinium menziesii subsp. pallidum +
Flowering spring.  +
Delphinium multiplex +
Flowering late spring–summer.  +
Delphinium newtonianum +
Flowering early summer.  +
Delphinium novomexicanum +
Flowering summer to early autumn.  +
Delphinium nudicaule +
Flowering late winter–early summer.  +
Delphinium nuttallianum +
Flowering spring (-early summer).  +
Delphinium nuttallii subsp. nuttallii +
Flowering late spring–early summer.  +
Delphinium nuttallii subsp. ochroleucum +
Flowering late spring.  +
Delphinium parishii subsp. pallidum +
Flowering spring–early summer.  +
Delphinium parishii subsp. parishii +
Flowering spring.  +
Delphinium parishii subsp. subglobosum +
Flowering late winter-mid spring.  +
Delphinium parryi subsp. blochmaniae +
Flowering early spring.  +
Delphinium parryi subsp. eastwoodiae +
Flowering spring.  +
Delphinium parryi subsp. maritimum +
Flowering late winter–spring.  +
Delphinium parryi subsp. parryi +
Flowering spring.  +
Delphinium parryi subsp. purpureum +
Flowering late spring–early summer.  +
Delphinium patens subsp. hepaticoideum +
Flowering spring.  +
Delphinium patens subsp. montanum +
Flowering late spring–early summer.  +
Delphinium patens subsp. patens +
Flowering spring.  +
Delphinium polycladon +
Flowering summer–early autumn.  +
Delphinium purpusii +
Flowering spring.  +
Delphinium ramosum +
Flowering summer.  +
Delphinium recurvatum +
Flowering spring.  +
Delphinium robustum +
Flowering summer.  +
Delphinium sapellonis +
Flowering summer.  +
Delphinium scaposum +
Flowering spring.  +
Delphinium scopulorum +
Flowering late summer–early autumn.  +
Delphinium stachydeum +
Flowering summer.  +
Delphinium sutherlandii +
Flowering spring.  +
Delphinium treleasei +
Flowering late spring.  +
Delphinium tricorne +
Flowering spring.  +
Delphinium trolliifolium +
Flowering spring.  +
Delphinium uliginosum +
Flowering late spring–early summer.  +
Delphinium umbraculorum +
Flowering late spring–early summer.  +
Delphinium variegatum subsp. kinkiense +
Flowering early spring.  +
Delphinium variegatum subsp. thornei +
Flowering spring.  +
Delphinium variegatum subsp. variegatum +
Flowering spring.  +
Delphinium viridescens +
Flowering summer.  +
Delphinium wootonii +
Flowering spring.  +
Delphinium xantholeucum +
Flowering spring.  +
Dendroalsia abietina +
Capsules mature Mar–Jun.  +
Dendromecon harfordii +
Flowering spring–early summer (Apr–Jul).  +
Dendromecon rigida +
Flowering spring–early summer (Apr–Jul).  +
Dendrophylax lindenii +
Flowering May–Aug, occasionally as early as Feb.  +
Dennstaedtia bipinnata +
Sporulates spring and early summer.  +
Dennstaedtia globulifera +
Sporulates summer.  +
Dennstaedtia punctilobula +
Sporulates in summer.  +
Descurainia adenophora +
Flowering Jun–Aug.  +
Descurainia brevisiliqua +
Flowering (late Jun-)Jul–Aug(-early Oct).  +
Descurainia californica +
Flowering Jun–Aug.  +
Descurainia incana +
Flowering May–Sep.  +
Descurainia incisa subsp. incisa +
Flowering late Jun–Aug.  +
Descurainia incisa subsp. paysonii +
Flowering May–Jun.  +
Descurainia kenheilii +
Flowering Aug–Sep.  +
Descurainia longepedicellata +
Flowering Apr–Jul.  +
Descurainia nelsonii +
Flowering late May-mid Jul.  +
Descurainia obtusa +
Flowering May–Sep(-Oct).  +
Descurainia paradisa +
Flowering Apr–Jun.  +
Descurainia pinnata subsp. brachycarpa +
Flowering Mar–Jul.  +
Descurainia pinnata subsp. glabra +
Flowering Feb–Apr(-Jun).  +
Descurainia pinnata subsp. ochroleuca +
Flowering mid Mar–Apr.  +
Descurainia pinnata subsp. pinnata +
Flowering Feb–Apr.  +
Descurainia sophia +
Flowering Mar–Jul.  +
Descurainia sophioides +
Flowering Jun–Sep.  +
Descurainia torulosa +
Flowering Jun–Jul.  +
Deutzia gracilis +
Flowering Apr–Jun.  +
Deutzia parviflora +
Flowering Apr–Jun.  +
Deutzia scabra +
Flowering Apr–Jul.  +
Diamorpha smallii +
Flowering spring.  +
Dianella ensifolia +
Flowering late spring.  +
Dianthus armeria subsp. armeria +
Flowering spring and summer.  +
Dianthus barbatus subsp. barbatus +
Flowering spring–early summer.  +
Dianthus carthusianorum +
Flowering summer.  +
Dianthus deltoides subsp. deltoides +
Flowering early summer.  +
Dianthus plumarius subsp. plumarius +
Flowering spring and summer.  +
Dianthus repens +
Flowering summer.  +
Diapensia lapponica +
Flowering May–Jun(-Aug).  +
Diapensia obovata +
Flowering Jun–Jul.  +
Diaperia candida +
Flowering and fruiting late Mar–early Jun.  +
Diaperia prolifera var. barnebyi +
Flowering and fruiting mid Apr–mid Jun.  +
Diaperia prolifera var. prolifera +
Flowering and fruiting (Apr–)May–Jun(–Sep).  +
Diaperia verna var. drummondii +
Flowering and fruiting mid Feb–mid May.  +
Diaperia verna var. verna +
Flowering and fruiting early Mar–late Jun(–Aug).  +
Dicentra canadensis +
Flowering early–late spring.  +
Dicentra chrysantha +
Flowering early spring–late summer.  +
Dicentra cucullaria +
Flowering early–late spring.  +
Dicentra eximia +
Flowering mid spring–early fall.  +
Dicentra formosa subsp. formosa +
Flowering early spring–early fall.  +
Dicentra formosa subsp. oregana +
Flowering early spring–early fall.  +
Dicentra nevadensis +
Flowering early–late summer.  +
Dicentra ochroleuca +
Flowering early spring–late summer.  +
Dicentra pauciflora +
Flowering late spring–late summer.  +
Dicentra uniflora +
Flowering very early spring–late summer.  +
Dichaetophora campestris +
Flowering (Feb–)Mar–Apr.  +
Dichelostemma capitatum subsp. capitatum +
Flowering mostly spring (Feb–Apr  +, as early as Dec in the south, as late as Jun–Jul for high-elevation populations).  +
Dichelostemma capitatum subsp. pauciflorum +
Flowering time highly variable with elevation.  +
Dichelostemma congestum +
Flowering spring (late Mar–May).  +
Dichelostemma ida-maia +
Flowering spring (May–early Jul).  +
Dichelostemma multiflorum +
Flowering spring (Apr–early Jun).  +
Dichelostemma volubile +
Flowering spring (Apr–early Jun).  +
Dichodontium olympicum +
Capsules mature summer–fall (Jul–Oct).  +
Dichodontium pellucidum +
Capsules mature late fall–early spring.  +
Dichondra argentea +
Flowering Apr–Nov.  +
Dichondra brachypoda +
Flowering Jun–Nov.  +
Dichondra carolinensis +
Flowering year-round.  +
Dichondra donelliana +
Flowering Feb–Jul(–Aug).  +
Dichondra micrantha +
Flowering Jan–Nov.  +
Dichondra occidentalis +
Flowering Jan.  +
Dichondra recurvata +
Flowering Feb–Jul.  +
Dichondra sericea +
Flowering: Mar–Dec [year-round].  +
Dichromanthus cinnabarinus +
Flowering Jul–Oct.  +
Dicoria canescens +
Flowering year round, mostly Oct–Feb.  +
Dicranella cerviculata +
Capsules mature summer.  +
Dicranella crispa +
Capsules mature spring and summer.  +
Dicranella heteromalla +
Capsules mature spring and summer.  +
Dicranella hilariana +
Capsules mature late summer.  +
Dicranella lindigiana +
Capsules mature spring.  +
Dicranella pacifica +
Capsules mature fall and winter.  +
Dicranella palustris +
Capsules mature spring.  +
Dicranella rufescens +
Capsules mature spring and summer.  +
Dicranella schreberiana +
Capsules mature fall.  +
Dicranella subulata +
Capsules mature spring and summer.  +
Dicranella varia +
Capsules mature spring.  +
Dicranocarpus parviflorus +
Flowering Sep–Oct.  +
Dicranostegia orcuttiana +
Flowering Mar–Aug.  +
Dicranoweisia cirrata +
Capsules mature late fall–winter.  +
Dicranoweisia crispula +
Capsules mature spring–early summer.  +
Dicranum acutifolium +
Capsules mature summer.  +
Dicranum bonjeanii +
Capsules mature spring.  +
Dicranum brevifolium +
Capsules mature summer.  +
Dicranum condensatum +
Capsules mature spring.  +
Dicranum elongatum +
Capsules mature in summer.  +
Dicranum flagellare +
Capsules mature in spring.  +
Dicranum fragilifolium +
Capsules mature in summer.  +
Dicranum fulvum +
Capsules mature in spring.  +
Dicranum fuscescens var. flexicaule +
Capsules mature summer.  +
Dicranum fuscescens var. fuscescens +
Capsules mature spring.  +
Dicranum groenlandicum +
Capsules mature in summer.  +
Dicranum howellii +
Capsules mature spring.  +
Dicranum leioneuron +
Capsules mature spring.  +
Dicranum majus var. majus +
Capsules mature spring.  +
Dicranum majus var. orthophyllum +
Capsules mature spring.  +
Dicranum montanum +
Capsules mature in spring.  +
Dicranum muehlenbeckii +
Capsules mature in summer.  +
Dicranum ontariense +
Capsules mature spring.  +
Dicranum pallidisetum +
Capsules mature in summer.  +
Dicranum polysetum +
Capsules mature spring.  +
Dicranum rhabdocarpum +
Capsules mature summer.  +
Dicranum scoparium +
Capsules mature spring.  +
Dicranum spadiceum +
Capsules mature in summer.  +
Dicranum spurium +
Capsules mature spring.  +
Dicranum tauricum +
Capsules mature in summer.  +