Description from Flora of China
Herbs, perennial, scandent, verrucose-glandular. Tuber spheroid, enlarged. Stems angular-sulcate. Leaf blade unlobed, margin sparsely dentate, abaxially pilose or densely tomentose. Tendrils spiralled above and below branch, 2-fid. Plants dioecious. Male flowers: inflorescence paniculate, bracteate; calyx segments 5, triangular, densely pubescent; corolla segments 5, lanceolate or obovate-lanceolate, base often with 5 scales; stamens 5, 4 connected in pairs, 1 free; anthers sigmoid. Female flowers solitary, paired, or 3 or 4 in raceme; staminodes 5, glanduliform; ovary ovoid; ovules numerous, horizontal; style stout, apex 3-lobed; stigma 2-lobed. Fruit subglobose or cylindric. Seeds subovoid or ovoid, winged, wing corky. 2n = 28.
Four species: China, India (Sikkim), Indonesia, Malaysia, Thailand, Vietnam; three species (one endemic) in China.
(Authors: Lu Anmin (路安民 Lu An-ming); Charles Jeffrey)