Dioscorea havilandii Prain & Burkill

Species

Angiosperms > Dioscoreales > Dioscoreaceae > Dioscorea

Characteristics

Tuber unknown. Stem glabrous, wiry, probably unarmed throughout. Bulbils none seen. Leaves alternate, decidedly coriaceous, elliptic or the larger so broad as to be almost circular, sometimes ovate [var. ovalifolia PRAIN & BURK. (1938)], abruptly acuminate (acumen to 10 mm), base just cordiform, to 11 by 9 cm, 5-nerved, the outermost nerves submarginal and the intermediate much nearer to the margin than to the midrib; upper surface somewhat shining, the larger nerves just prominent after the leaf has been dried; petiole xh the length of the lamina. Male flowering axes gathered into large leafless branches up to 70 cm long, the axes directed strictly upwards and flower-less through 2-5 mm at the base, then fertile with about 40 flowers, angled. Buds globose, up to 1 mm long. Female flowering axes to 35 cm and probably at times longer. Capsules broader than in the species immediately following; wings to 20 by 22 mm, apex retuse, base subtruncate.
Life form annual
Growth form herb
Growth support -
Foliage retention -
Sexuality dioecy
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) -
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Mountain ridges, near Kuching apparently common.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 21 - 36
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Distribution

Dioscorea havilandii world distribution map, present in Malaysia

Identifiers

LSID urn:lsid:ipni.org:names:318047-1
WFO ID wfo-0000390874
COL ID 36CQP
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Dioscorea havilandii