ARISARUM

Arisarum vulgare, common name Cobra Plant, Friar's Cowl or Larus, is a herbaceous, perennial, with an underground rhizome plant in the genus Arisarum belonging to the family Araceae. Arisarum vulgare reaches an average height of 10–30 cm.

The leaves of this geophyte plant are basal only, wide, ovate to arrow-shaped, with a petiole 12–15 cm long. The stems are erect and unbranched, usually mottled and grow directly from the underground rhizome. A single leaflike bract (spathe) forms a purplish-brown or olive green striped tube about 15 cm long, with an open upper part helmet or hood-shaped curved forward. It encloses a fleshy greenish club-like spike (spadix) bent forward, protruding from the tube and bearing at the bottom minute purple violet flowers. The 20 male flowers are located above the four to six female, with sterile flowers completely missing.

The flowering period extends from Autumn to Spring. The sexes are united in the same individual plant. Pollination is granted by insects (entomophily). The fruits are greenish berries of about 1 centimetre long. This plant native to Mediterranean region of southern Europe and northern Africa, east to the Caucasus, and west to the Canary Islands, the Azores and Madeira.

Arisarum vulgare prefers grassy fields and rocky scrubland, forests and wasteland, mainly in shady and cool places and in moist soils, at an altitude of 0–800 metres above sea level. Grow this cautiously in the garden as it can become quite invasive.

This post is part of the Floral Friday Fotos meme

MELBOURNE WEEDS 14 - ITALIAN ARUM

Arum italicum is a species of flowering herbaceous perennial plant in the family Araceae, also known as Italian arum and Italian lords-and-ladies. It is native to the Mediterranean region (southern Europe, northern Africa, and the Middle East) plus Great Britain, the Netherlands, Crimea, Caucasus, Canary Islands, Madeira, and the Azores. It is also naturalised in Argentina and in scattered locations in the United States.

It grows 30–46 cm high, with equal spread. It blooms in spring with white flowers that turn to showy red fruit. It is cultivated as an ornamental plant for traditional and woodland shade gardens. Subspecies italicum (the one normally grown in horticulture) has distinctive pale veins on the leaves, whilst subspecies neglectum has faint pale veins, and the leaves may have dark spots. Some gardeners use this arum to underplant with Hosta, as they produce foliage sequentially: When the Hosta withers away, the arum replaces it in early winter, maintaining ground-cover.

Numerous cultivars have been developed for garden use, of which A. italicum subsp. italicum 'Marmoratum' has gained the Royal Horticultural Society's Award of Garden Merit. Arum italicum can be invasive in some areas. Arum italicum may hybridise with Arum maculatum. In 1778, Lamarck noticed that the inflorescence of this plant produces heat.

Leaves, fruits and rhizomes contain compounds that make them poisonous. Notably, leaves are rich in oxalic acid; other active principles are present in other parts. The ingestion of berries, which are showy and red, may result fatal for babies and young children. As a general rule, avoiding consumption is advisable for adults too.

This post is part of the Floral Friday Fotos meme.

RARE FLOWER IN THE BOTANIC GARDENS

Amorphophallus titanum (titan arum) has a massive inflorescence (flowering structure) consisting of a spathe (collar-like structure) wrapped around a spadix (flower-bearing spike). The spathe is the shape of an upturned bell. It is green speckled with cream on the outside, and rich crimson on the inside. It has ribbed sides and a frilled edge, and can be up to three metres in circumference. The flowers are carried on the lower end of the greyish-yellow spadix. At the base of the spadix, within the protective chamber formed by the spathe, is a band of cream male flowers above a ring of the larger pink female flowers.

When the flowers are ready for pollination, the spadix heats up and emits a nauseating smell. This stench is so bad that the Indonesians call the plant ‘the corpse flower’. The inflorescence rises from a tuber, a swollen underground stem modified to store food for the plant. This tuber, more or less spherical in shape and weighing 70 kg or more, is the largest such structure known in the plant kingdom.

The titan arum of the Melbourne Botanic Gardens flowered at Christmas this year and attracted thousands of people who queued for hours in order to see this amazing flower. Amorphophallus titanum is restricted to Sumatra in the Indonesian archipelago. Such is the unpredictable nature of the plant that we cannot tell whether it will be months, years or even decades before we next see a titan arum flower in the Gardens.

This post is part of the Floral Friday Fotos meme,

and also part of the Signs, Signs meme.