Dioscorea gracillima Miquel var. collettii (J. D. Hooker) Uline ex Yamamoto; D. hui R. Knuth; D. kelungensis Hayata; D. nigrescens R. Knuth; D. oenea Prain & Burkill; D. seniavinii Prain & Burkill; D. tashiroi Hayata.

Leaf blade triangular-cordate or ovate-lanceolate, margin not transparent. Anther connective often 1--2 × as wide as anther at anthesis. Capsule broadly obovoid, apex truncate or rounded. Fl. May--Aug, fr. Jun--Oct.

Secondary Quercus forests, scrub forests; 1500--3200 m. S Anhui, Fujian, N Guangdong, NE Guangxi, Guizhou, S Henan, Hubei, Hunan, Jiangxi, W Sichuan, N Taiwan, Zhejiang [India, Myanmar].