[Botany • 2023] Vincetoxicum sangyojarniae (Apocynaceae: Asclepiodoideae) • Molecular Phylogenetic and Morphological Analyses support Recognition of A New Species of Vincetoxicum from eastern Thailand

 

Vincetoxicum sangyojarniae A.Kidyoo,

in A. Kidyoo et M. Kidyoo, 2023.

 DOI: doi.org/10.1007/s00606-023-01866-y 

Abstract

An unknown Vincetoxicum species has recently been discovered in eastern Thailand. It is a twiner that resembles in its morphology Vincetoxicum flexuosum s.l., a variable taxon widely occurring from tropical Asia to Australia. Morphological examination showed that despite similarities in growth habit, leaf shape, gross appearance of inflorescence structure and flower colour, these two elements exhibit substantial differences in both vegetative and floral characters that clearly distinguish one from the other, particularly shape of the flower bud and indumentum on the corolla lobes. In addition, we also evaluated phylogenetic relationships based on DNA sequence data for ITS, trnT-L, trnL and trnL-F markers of this new Vincetoxicum sp. with congeners (including, inter alia, new sequences of the two varieties recognized in Thailand of V. flexuosum s.l., i.e. var. flexuosum and var. tenue). The analyses demonstrated that the new Vincetoxicum sp. is not closely related to the taxa recognized in V. flexuosum s.l. Instead, it was retrieved as sister to a clade containing the African taxa, Vincetoxicum caffrum, Vincetoxicum lycioides and Vincetoxicum fleckii. Therefore, integrated analyses of morphology and molecular phylogeny revealed the new Vincetoxicum sp. to be a well-defined species clearly distinct from V. flexuosum s.l., as well as from all other known congeners. The morphological similarity between the new Vincetoxicum sp. and V. flexuosum s.l. likely resulted from convergence, leading to various taxonomic complications. We here describe it as a new species, Vincetoxicum sangyojarniae, sp. nov., and provide a detailed description, illustration and photographs. Moreover, as phylogenetic relationships revealed that V. flexuosum s.l. is not monophyletic in its actual circumscription, a taxonomic reconsideration of this taxon is suggested.

Keywords: Convergence, Phylogeny, The Vincetoxicum flexuosum complex, Tylophora, Tylophorinae

Vincetoxicum sangyojarniae A.Kidyoo, sp. nov.

—TYPE: Thailand, Surin Province, 

Muang district, Rajamangala University of Technology Isan Surin Campus, ....

Etymology: The specific epithet ‘sangyojarniae’ is given in honour of Asst. Prof. Pacharaporn Sangyojarn, the senior botanist of the Faculty of Agriculture and Technology, Rajamangala University of Technology Isan, who first discovered and drew our attention to the plant.

 

Aroonrat Kidyoo and Manit Kidyoo. 2023. Molecular Phylogenetic and Morphological Analyses support Recognition of A New Species of Vincetoxicum (Apocynaceae, Asclepiadoideae) from eastern Thailand.  Plant Systematics and Evolution. 309, 27. DOI: doi.org/10.1007/s00606-023-01866-y 

 Researchgate.net/publication/372444224_a_new_species_of_Vincetoxicum_from_eastern_Thailand

[Botany • 2024] Sarcolobus busbanianus & S. flavus (Apocynaceae: Asclepiadoideae: Marsdenieae) • Phylogenetic Positions of Thai Members of Gymnema, Gymnemopsis and Sarcolobus, and Two New Sarcolobus Species uncovered by Morpho-molecular Evidence

a, b Sarcolobus busbanianus A.Kidyoo & Kidyoo,
c, d S. flavus A.Kidyoo & Kidyoo,

in M. Kidyoo, A. Kidyoo et McKey. 2024. 

 DOI: 10.1007/s10265-024-01562-z

Photographs by A. Kidyoo

Abstract  

The present study assesses the phylogenetic position of certain Thai members of Gymnema, Gymnemopsis, and Sarcolobus in relation to other known Marsdenieae species. Fifteen accessions newly sequenced from Thailand were added to the dataset of the homologous sequences of 125 accessions of Marsdenieae downloaded from GenBank. In our molecular phylogeny, almost all the delimited major clades and their relationships are largely congruent with those revealed in previous studies. The monophyly of Gymnema (including the former Jasminanthes species) and that of Sarcolobus, as presently circumscribed, are confirmed. The new accessions of these two genera from Thailand are well grouped with the members of their respective genera. Our analyses provide the first molecular evidence for recognition of Gymnemopsis, a small Asian genus that has never been included in the previous phylogenetic studies, as a distinct genus. All elements of Gymnemopsis are retrieved as a well-supported monophyletic group that is strongly supported as sister to Lygisma, another small Asian genus that most closely resembles it in growth habit, color of latex, indumentum on plant parts, corona structure and follicle traits. Combined molecular phylogenetic, morphological and ecological data also support recognition of two new Sarcolobus species from Thailand, Sarcolobus busbanianus sp. nov. and S. flavus sp. nov. Similarities and differences between these new species and their close relative, S. carinatus, are discussed. In addition, this study also reveals the first record for Thailand of Gymnema lacei. Keys to the species of Gymnemopsis (for all members of the genus), Gymnema and Sarcolobus (for Thai members of these genera) are provided.

 

Keywords: CpDNA, ITS, Mainland Southeast Asia, Marsdenia, Molecular phylogeny, Morphological taxonomy

 

Comparison of inflorescence (a, c) and floral morphology (b, d, e, f).
a, b Sarcolobus busbanianus sp. nov. 
c, d S. flavus sp. nov. 
e S. carinatus f S. globosus. 

Photographs by A. Kidyoo

Sarcolobus busbanianus A.Kidyoo & Kidyoo, sp. nov.

Etymology This species was named in honour of Assoc. Prof. Busban Na Songkhla, a senior instructor in the Department of Botany, Faculty of Science, Chulalongkorn University, who has made important contributions to plant taxonomic knowledge in Thailand.

Sarcolobus flavus A.Kidyoo & Kidyoo, sp. nov. 

Etymology The specific epithet ‘flavus’ refers to the bright yellow color of its flowers.

Manit Kidyoo, Aroonrat Kidyoo and Doyle McKey. 2024. Phylogenetic Positions of Thai Members of Gymnema, Gymnemopsis and Sarcolobus (Apocynaceae, Asclepiadoideae, Marsdenieae), and Two New Sarcolobus Species uncovered by Morpho-molecular Evidence.  Journal of Plant Research. DOI: doi.org/10.1007/s10265-024-01562-z

 

[Botany • 2018] Ceropegia boonjarasii (Apocynaceae: Asclepiodoideae) • A New Species from eastern Thailand

Ceropegia boonjarasii Kidyoo, 

in Kidyoo, 2018. 

DOI: 10.11646/phytotaxa.385.1.4

 newspecies.botany.SC.Chula.ac.th

Abstract

Ceropegia boonjarasii Kidyoo, a new species from eastern Thailand is here described, illustrated and compared morphologically and ecologically to C. sootepensis Craib and C. laotica Rodda & Meve, its putative close relatives. These three species display clear differences in habitat choice, hairiness of leaf surface and corolla lobes, and in the shape of interstaminal corona segments.

Keywords: Apocynaceae, Asclepiadoideae, eastern Thailand, open sandy area, Eudicots

Manit Kidyoo. 2018.  A New Species of Ceropegia (Asclepiadoideae, Apocynaceae) from eastern Thailand. Phytotaxa. 385(1); 31–36. DOI: 10.11646/phytotaxa.385.1.4

 newspecies.botany.SC.Chula.ac.th/en/species/ceropegia-boonjarasii-2 

[Botany • 2021] Ceropegia calcicola & C. thorutii (Asclepiodoideae, Apocynaceae) • Two New Species of Ceropegia on Limestone Hills in Northern Thailand

Ceropegia calcicola Kidyoo

in Kidyoo, 2021.

Tropical Natural History. 21(1)

 tci-thaijo.org/index.php/TNH 

Abstract

Two new lithophytic climbers with clustered fusiform roots, Ceropegia calcicola Kidyoo and C. thorutii Kidyoo, from northern Thailand are here described. Illustrations, photographs, and comparisons of diagnostic characters with the morphologically similar species are provided.

 Keywords: Ceropegia calcicola, C. thorutii, section Chionopegia, section Janthina, twining herb

Ceropegia calcicola Kidyoo.
A. Flowering branch. B. Acluster of fusiform roots. C. Open flower. D. Flower bud. E. Bottom view of flower showing calyx. F. Longitudinal section of flower showing corona and gynostegium. G. Side view of gynostegium and corona. H. Top view of gynostegium and corona. I. Pollinarium. J. Fruit.

Photos by Manit Kidyoo from M.Kidyoo 1561 (A-I) and M.Kidyoo 1640(J)

Ceropegia calcicola Kidyoo sp. nov.

Ceropegia calcicola differs from the morphologically similar C. khasiana in having ovate leaves, entirely glabrous corolla and shallowly bifid interstaminal corona lobes. In contrast, C. khasiana has lanceolate or linear-lanceolate leaves, corolla tube with a ring of trichomes on the inside at the distal part of the swollen basal portion, corolla lobes that are puberulent on the adaxial surface, and deeply bifid interstaminal corona lobes. 

 Etymology.– The specific epithet ‘calcicola’ refers to limestone hill, the usual habitat of this plant.

Ecology and distribution.– Ceropegia calcicola is endemic to Thailand, occurring on limestone rock in shady to open areas on limestone hills at 350–1600 m alt. It usually grows inside rock cracks or rock pools where humus soil has collected. Its branches climb up small shrubs or cliffs. Flowering occurs from July to October.

Ceropegia thorutii Kidyoo sp. nov. 

 Ceropegia thorutii is similar to C. elegans in having pedunculate cyme, strongly curved corolla tube being inflated at base, broadly ovate-triangular corolla lobes shorter than corolla tube and joined at tips forming a subglobose dome, but can be distinguished by its glabrous corolla tube being slightly inflated at base, bifid interstaminal corona lobes with triangular segments being shorter than half the length of the staminal corona lobes, and spathulate-clavate staminal corona lobes. 

 Ecology and distribution.– Ceropegia thorutii is endemic to Thailand, occurring on limestone rock in shady areas within highland limestone forest at 1,500–1,600 m alt. It grows inside rock cracks or rock pools where humus soil has collected or in calcareous soil intermingled with other herbs and small shrubs. Its stem and branches usually climb up on small shrubs and cliffs, or branches can be pendent. Flowering occurs in July–October.

Etymology.–The specific epithet, ‘thorutii’ was designated in honor of Mr. Chanin Thorut who first discovered and drew my attention to this plant.

Manit Kidyoo. 2021. Two New Species of Ceropegia (Apocynaceae, Asclepiadoideae) on Limestone Hills in Northern Thailand. Tropical Natural History. 21(1); 1-11. tci-thaijo.org/index.php/TNH/article/view/245810

[Botany • 2020] Ceropegia phuchongensis (Apocynaceae: Asclepiodoideae) • A New Species from eastern Thailand

Ceropegia phuchongensis Kidyoo & K. Suwann.

in Kidyoo & Suwannakote, 2020. 

 taiwania.ntu.edu.twid=1659  

 facebook.com/TaiwaniaOffice

Abstract
A new species from Phu Chong-Na Yoi National Park, Ubon Ratchathani Province, eastern Thailand, Ceropegia phuchongensis Kidyoo & K. Suwann. (Apocynaceae, Asclepiadoideae), is described, illustrated and compared with the related C. tenuicaulis Kidyoo. The new species differs in corolla tube shape, color and trichomes inside the corolla tube, as well as pollinium and corpusculum shape. In addition, the gynostegium surfaces of the two species also support the distinctiveness of the new species.

Keyword: Apocynaceae, Asclepiadoideae, Ceropegieae, dry deciduous forest, grass-like habit, Thailand, Tiloris

Fig 3. Illustrations of Ceropegia phuchongensis sp. nov. A. Flowering branch; B. Flower; C. Flower bud; D. Longitudinal section of flower showing corona and gynostegium; E. Top view of gynostegium; F. Calyx; G. Pollinarium; H. Fruit; I. Seed. Drawn by Manit Kidyoo from M. Kidyoo 1570(A-F) and M. Kidyoo 1652(G-I).

Fig 4. Ceropegia phuchongensis sp. nov. A. Habitat; B. Habit; C. Flowers. All photographs by M. Kidyoo.

Fig 1. Reproductive structures of Ceropegia phuchongensis sp. nov. (A-C) and C. tenuicaulis (D-F):
A, D. Flowers; B, E. Longitudinal sections of corolla tubes; C, F. Pollinaria. Photographs by M. Kidyoo.

Fig 2. SEM photographs of gynostegium and corona of Ceropegia phuchongensis sp. nov. (A-C) and C. tenuicaulis (D-F).
A, D. Top view of gynostegia; B, E. Side view of gynostegia (stipes were removed); C, F. Basal parts of staminal corona lobes.

Ceropegia phuchongensis Kidyoo & K. Suwann., sp. nov. 

Diagnosis: Ceropegia phuchongensis differs from C. tenuicaulis in having an ovoid to globose corolla tube of 0.7–1.0 cm length and 0.6–0.9 diam. which is inflated at its mid-length. The interior of this inflated part is yellowish white with irregular purplish brown dots and stripes, and densely covered with wrinkled, whitish trichomes of 0.9– 1.5 mm length. In contrast, C. tenuicaulis has an ovoidtubular corolla tube of 1.7–2.2 cm length and 0.5–0.6 cm diam. The tube has a slightly inflated basal portion and a long narrow upper part. The interior of its inflated part is plain purplish brown and covered with scattered white trichomes of 0.7–1.4 mm length.

Etymology: Ceropegia phuchongensis is named after the Phu Chong-Na Yoi National Park, the type locality.

 Distribution and habitat: Ceropegia phuchongensis is currently known from only two localities in eastern Thailand. This plant is a perennial herb growing in sandy soil among tall grasses in the open area of dry deciduous dipterocarp


Manit Kidyoo and Kamonchanok Suwannakote. 2020. Ceropegia phuchongensis (Apocynaceae, Asclepiadoideae), A New Species from eastern Thailand. Taiwania. 65(2); 101-108.

taiwania.ntu.edu.tw/abstract.php?type=abstract&id=1659

 facebook.com/TaiwaniaOffice/posts/2483453138543167

   

[Botany • 2019] Heterostemma ficoides (Apocynaceae: Asclepiodoideae) • A New Species with Fig-like Flowers from Northern Thailand

Heterostemma ficoides A.Kidyoo

in A. Kidyoo, 2019.

   DOI: 10.1007/s12225-019-9815-4 

 facebook.com/KewBulletin

Heterostemma ficoides A.Kidyoo, a new species of Heterostemma sect. Oianthus with a fig-like flower discovered in northern Thailand is here described. Photographs, line illustrations and detailed comparison with the similar species, H. vasudevanii Swarupan. & Mangaly are provided. Heterostemma ficoides resembles H. vasudevanii in having a fleshy globose flower and the presence of the inner corona appendages, but clearly differs in leaf shape, leaf venation, presence of dense hairs on the outer and inner surfaces of the corolla, and apex of the staminal corona lobes. An identification key to the species of sect. Oianthus is presented.

Keywords: Ceropegieae, evergreen forest, inner corona appendages, sect. Oianthus

Fig. 2 Heterostemma ficoides. A habitat; B flowering branch; C inflorescence; D fruit; E longitudinal section of flower; F cross section of flower; G top view of gynostegium. Photos: Aroonrat Kidyoo.

Heterostemma ficoides A. Kidyoo sp. nov. 

Etymology. The specific epithet ‘ficoides’ alludes to the striking similarity of its flower to a fig of Ficus species.

Aroonrat Kidyoo. 2019. Heterostemma ficoides (Apocynaceae: Asclepiadoideae), A New Species with Fig-like Flowers from Northern Thailand. Kew Bulletin. DOI: 10.1007/s12225-019-9815-4

facebook.com/KewBulletin/photos/2451795891720427

[Botany • 2018] Ceropegia foetidiflora (Asclepiodoideae, Apocynaceae) • A New Species from northeastern Thailand

Ceropegia foetidiflora Kidyoo

in Kidyoo, 2018. 

    DOI: 10.6165/tai.2018.63.327

ABSTRACT

 A newly discovered species from northeastern Thailand, Ceropegia foetidiflora Kidyoo, is here described and illustrated. Photographs and diagnostic comparison with the morphologically similar species, C. thorelii Costantin, are provided. These two species display clear difference in hairiness on the surfaces of the corolla tube and the corolla lobes, and shape of the corolla lobes. 

KEY WORDS: Apocynaceae, Asclepiadoideae, Northeastern Thailand, Open sandy area, Strong musty smell. 

Fig. 1. Illustrations of Ceropegia foetidiflora sp. nov. (a) habit, (b) flower bud, (c) longitudinal section of flower showing corona and gynostegium, (d) top view of gynostegium, (e) pollinarium, (f) fruit, (g) seed.

Drawn by Manit Kidyoo from M. Kidyoo 1557 (a)–(e) and M. Kidyoo 1616 (f)–(g).

Fig. 2. Vegetative and reproductive parts of Ceropegia foetidiflora sp. nov. 

Ceropegia foetidiflora Kidyoo, sp. nov. 

Ceropegia foetidiflora is distinguished from C. thorelii by its corolla tube which is glabrous outside, lanceolate-oblong corolla lobes that are nearly as long as the tube and densely pubescent on the adaxial surface and glabrous on the abaxial surface. Contrarily, C. thorelii bears pubescent corolla tube, ovate-lanceolate corolla lobes that are shorter than the tube and hairy on the midrib of the adaxial surface and pubescent on the abaxial surface as well as margins. 

Type: THAILAND. Phu Langka National Park, Bueng Kan Province, 520 m a.s.l., 14 August 2012, M. Kidyoo 1557 (holotype: BKF, isotype: BCU). 

Habitat, ecology and distribution: Ceropegia foetidiflora occurs about 520 m a.s.l. in Phu Langka National Park, Bueng Kan Province, northeastern Thailand (Fig. 3). It is perennial herb growing in sandy soil, open areas of dry deciduous dipterocarp forest. Flowering July–October. 

Fig. 2. Vegetative and reproductive parts of Ceropegia foetidiflora sp. nov. (a–c) compared with those of C. thorelii (d–e): (a) habit; (b), (d) flower; (c), (e) side view of gynostegium.

Photograph by Manit Kidyoo.

Manit Kidyoo. 2018. Ceropegia foetidiflora sp. nov. (Asclepiodoideae, Apocynaceae), A New Species from northeastern Thailand. Taiwania. 63(4); 327-332.   DOI: 10.6165/tai.2018.63.327

[Botany • 2018] Dendrobium obchantiae • A Narrow Endemic New Species of Dendrobium sect. Stachyobium (Orchidaceae: Malaxideae) from Thailand

Dendrobium obchantiae

 Promm., Suddee & Kidyoo

in Prommanut, Kidyoo, Buddhawong & Suddee, 2018

DOI:  10.11646/phytotaxa.348.2.3

 facebook.com/BotGeneCHULA

Abstract

A new species belonging to Dendrobium section Stachyobium was discovered in mixed deciduous forest near the Check Point to Thi Lo Su Waterfall, Umphang District, Tak Province, in the northern Thailand. A description (including leaf anatomy), illustration and comparison with the closely related species D. incurvum are provided here.

Keywords: Orchidaceae, Dendrobium sect. Stachyobium, Dendrobium obchantiae, orchid flora of Thailand, Monocots

Phattaravee Prommanut, Manit Kidyoo, Wins Buddhawong and Somran Suddee. 2018. A Narrow Endemic New Species of Dendrobium sect. Stachyobium from Thailand (Orchidaceae: Malaxideae). Phytotaxa. 348(2); 90-98. DOI:  10.11646/phytotaxa.348.2.3

 facebook.com/BotGeneCHULA/posts/706778239492451

Researchgate.net/publication/324796786_A_endemic_new_species_of_Dendrobium_from_Thailand

กล้วยไม้ชนิดใหม่ของโลก

Dendrobium obchantiae Promm., Suddee & Kidyoo

กล้วยไม้สกุลหวาย Dendrobium obchantiae Promm., Suddee & Kidyoo เป็นพืชชนิดใหม่ของโลก พบที่ อ. อุ้มผาง จ.ตาก โดยนายภัทธรวีร์ พรมนัส นิสิตระดับปริญญาโท ภาควิชาพฤกษศาสตร์ คณะวิทยาศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย ดร. สมราน สุดดี นักวิทยาศาสตร์ชำนาญการพิเศษ สำนักงานหอพรรณไม้ (BKF) สำนักวิจัยการอนุรักษ์ป่าไม้และพันธุ์พืช กรมอุทยานแห่งชาติ สัตว์ป่าและพันธุ์พืช และ รศ. ดร. มานิต คิดอยู่ ภาควิชาพฤกษศาสตร์ คณะวิทยาศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย . 

กล้วยไม้ชนิดนี้ตั้งชื่อเป็นเกียรติแก่ รศ. ดร. อบฉันท์ ไทยทอง ผู้เชี่ยวชาญกล้วยไม้ไทย อาจารย์ภาควิชาพฤกษศาสตร์ คณะวิทยาศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย ตีพิมพ์เผยแพร่ในวารสาร Phytotaxa. 348(2); 90–98

[Botany • 2017] Dendrobium chiangdaoense • A New Species (Orchidaceae) from northern Thailand

Dendrobium chiangdaoense

Promm., Kidyoo, Buddhawong & Suddee 

เอื้องข้าวตอกเชียงดาว || DOI: 10.11646/phytotaxa.307.1.8   facebook.com/BotGeneCHULA

Abstract

Dendrobium chiangdaoense, a new species belonging to Dendrobium section Stachyobium is described and illustrated. It is only known from the type locality in mixed deciduous forest at ca. 800 m elev. on limestone hills in Chiang Dao District, Chiang Mai Province, northern Thailand. It most closely resembles D. dixonianum, a more widespread northern Thailand species occurring in upper montane rain forest at 1,650–1,800 m elev.

Keywords: Orchidaceae, Dendrobium sect. Stachyobium, Dendrobium chiangdaoense, new species, Monocots

FIGURE 2. Dendrobium chiangdaoense (Buddhawong & Suddee 018); plants in natural habitat.

photo by W. Buddhawong. 

Dendrobium chiangdaoense (Buddhawong & Suddee 018); flowers and inflorescence.

photo by W. Buddhawong. 

Dendrobium chiangdaoense Promm., Kidyoo, Buddhawong & Suddee sp. nov. 

Dendrobium chiangdaoense is most similar to D. dixonianum but differs in having bract longer than pedicel plus ovary, inflorescences not exceeding leaves, lateral sepals obliquely falcate-triangular not recurved, labellum bright green, apex of keel acute and not divided to lobes.

Type:—THAILAND. Chiang Mai Province: Chiang Dao District, ..., ca. 800 m elev.,

October 2015, Buddhawong & Suddee 018 (holotype BKF!).

Distribution.—Northern Thailand (Chiang Mai Province). 

Habitat & Ecology.—Epiphytic herb on tree trunks in mixed deciduous forest on limestone hills at ca. 800 m elev. Flowering from October to November. 

Etymology.—The epithet “chiangdaoense” refers to the Chiang Dao District, the locality where the plants were found and collected.

Phattaravee Prommanut, Manit Kidyoo, Wins Buddhawong and Somran Suddee. 2017. Dendrobium chiangdaoense (Orchidaceae), A New Species from Thailand.  Phytotaxa. 307(1); 84-88. 

DOI: 10.11646/phytotaxa.307.1.8

 facebook.com/BotGeneCHULA/posts/607166449453631

กล้วยไม้ชนิดใหม่ของโลก: เอื้องข้าวตอกเชียงดาว

Dendrobium chiangdaoense Prommanut, Suddee, Buddhawong & Kidyoo

. 

เอื้องข้าวตอกเชียงดาวเป็นกล้วยไม้ชนิดใหม่ของโลก พบขึ้นตามต้นไม้ในป่าเต็งรังบนเขาหินปูนทางภาคเหนือของไทย ตีพิมพ์ในวารสาร Phytotaxa เล่มที่ 307(1) หน้าที่ 84–88 ปี 2017 โดยนายภัทธรวีร์ พรมนัส ดร. สมราน สุดดี นักวิทยาศาสตร์ชำนาญการพิเศษ สำนักงานหอพรรณไม้ (BKF) สำนักวิจัยการอนุรักษ์ป่าไม้และพันธุ์พืช กรมอุทยานแห่งชาติ สัตว์ป่าและพันธุ์พืช นายวิน พุทธวงศ์ นักวิจัยอิสระ และ รศ. ดร. มานิต คิดอยู่ ภาควิชาพฤกษศาสตร์ คณะวิทยาศาสตร์ จุฬาลงกรณ์มหาวิทยาลัย 

.

ในประเทศไทยพบกล้วยไม้ชนิดนี้ได้ที่จังหวัดเชียงใหม่เท่านั้น คำระบุชนิด “chiangdaoense” หมายถึง ดอยเชียงดาว สถานที่ที่พบเป็นครั้งแรก กล้วยไม้ชนิดนี้เป็นพืชถิ่นเดียว (endemic species) ของไทย

   

[Botany • 2017] Ceropegia digitiformis sp. nov. (Apocynaceae, Asclepiadoideae) from northeastern Thailand

Ceropegia digitiformis Kidyoo

tai2.NTU.edu.tw/Taiwania 

ABSTRACT

 A new species, Ceropegia digitiformis Kidyoo, was discovered from northeastern Thailand. It is here described and illustrated. Photographs and a diagnostic comparison with the morphologically similar related species, Ceropegia thwaitesii Hook., are also provided. These two species display clear difference in shapes and pubescence of the corona lobes.

 KEY WORDS: Apocynaceae, Asclepiadoideae, Ceropegia, northeastern Thailand

Fig. 2. Photographs showing habitat, vegetative and reproductive parts of Ceropegia digitiformis Kidyoo: A. habitat (Phu Langka National Park), B. flowering branch, C. long section of flower, G. side view of gynostegium, H. top view of gynostegium.  

Ceropegia digitiformis Kidyoo, sp. nov.  

Ceropegia digitiformis can be distinguished from C. thwaitesii by its outer corona of the same length as inner corona, glabrous outer coronal lobe whose apex is deeply bifid with linear-lanceolate segments, and linear-lanceolate inner corona lobes.

Fig. 2. Photographs showing habitat, vegetative and reproductive parts of Ceropegia digitiformis Kidyoo: A. habitat (Phu Langka National Park), B. flowering branch, C. long section of flower, D. calyx, E. pollinarium, F. underground stem with small tubers, G. side view of gynostegium, H. top view of gynostegium. 

Etymology: The specific epithet ‘digitiformis’ refers to the finger-like structure of the outer corona, brought about by division of each outer corona lobe at the apex extending through most of its whole length into two segments. Each segment is linear-lanceolate, subterete, slightly compressed with a blunt apex (Fig.1C & 2G)

Manit Kidyoo and Chanita Paliyavuth. 2017. Ceropegia digitiformis sp. nov. (Apocynaceae, Asclepiadoideae) from northeastern Thailand. 

Taiwania. 62(1): 24‒28.    DOI:  10.6165/tai.2017.62.24

http://tai2.ntu.edu.tw/taiwania/abstract.php?type=abstract&id=1481

http://tai2.ntu.edu.tw/taiwania/pdf/tai.2017.62.24.pdf

[Botany • 2015] Hoya rostellata • A New Species (Apocynaceae: Asclepiadoideae) from the western and northern parts of Thailand

ABSTRACT

 The new species Hoya rostellata Kidyoo (Apocynaceae: Asclepiadoideae) is described and illustrated. This plant is distributed in the western and northern parts of Thailand, usually grows on limestone rock and climbs up on tree in the forest edge. It is distinguished from the closest relative, H. siamica Kerr by leaf shape, leaf base, leaf apex, presence of vein and habitats.

 KEY WORDS: Apocynaceae, Asclepiadoideae, Hoya rostellata, limestone rock, new species, Thailand

Manit Kidyoo. 2015. Hoya rostellata (Apocynaceae: Asclepiadoideae), A New Species from Thailand. Taiwania. 60(1): 39‒42, 2015 DOI: 10.6165/tai.2015.60.39