Dioscoreaceae

薯蕷科

Flora of Taiwan

Dioscoreaceae 薯蕷科

特徵描述

屬列表

標本列表

特徵描述

作者

HUANG, Tseng-Chieng and HSIAO, Jin-Long

型態特徵

Twining-climbing or seldom erect herbs; rhizomes various, most often a large, basal tuber. Leaves alternate or opposite, rarely whorled, simple or compound, entire, undulate or palmately lobed; petiole and blade distinct, petiole commonly twisted or jointed at base and often with a stipule-like flange; blade broad, or even compound, commonly with 3-11 parallel, curving-convergent main veins, and a network of veinlets. Flowers small, in racemes, spikes or panicles, unisexual, regular, trimerous; perianth segments 6, usually connate at base; stamens 3 or 6, usually in two series, the inner usually staminodial; filaments distinct or short connate at base; gymnoecium of 3 carpels united to form a compound, inferior, trilocular ovary; placentation axile; style distinct or connate basally, with separate stigmas; ovules 2 (-many) in each locule. Fruit a 3-winged capsule.

屬

About ten genera, with more than 650 species in subtropical and tropical regions, a few extending to the north temperate zone. One genus and 14 species in Taiwan.

參考文獻

HUANG, Tseng-Chieng and HSIAO, Jin-Long, Flora of Taiwan, second edition 5: 87. 2000. (Fl. Taiwan 2nd edit.)
Ting, C.-T., M.-C. Chang and P.-P. Ling, Flora Reipublicae Popularis Sinicae 16(1): 60-120. 1985. (Fl. Reip. Pop. Sin.)

Dioscorea 薯蕷屬

作者

HUANG, Tseng-Chieng and HSIAO, Jin-Long

型態特徵

Twining vines with various tubers, dioecious. Stems terete, ridged or winged, pale green or violet, often bearing tubers (bulbils) in axils of leaves. Leaves simple, entire or palmately lobed, or compound with 3-7 leaflets; venation reticulate, with 3-11 nerves extending to apex, long- petiolate; petiole usually sulcate on upper surface, dilated at base or at both ends. Flowers in spikes, racemes or panicles, 1-many fasciculate in axils, regular, small; perianth segments six, in two series; staminate flowers with six fertile stamens, or sometimes three fertile stamens and three staminodes; anthers 2-celled; rudimentary ovary present or not; pistillate flowers with 0, 3, or 6 staminodes; pistil solitary; ovary inferior, 3-locular; placentation axile; ovules 2-many in each locule; style trifid, stigma bifurcate. Capsules 3-winged; seeds winged.