日本薯蓣 (原变种) ri ben shu yu (yuan bian zhong)

Dioscorea belophylloides Prain & Burkill; D. japonica var. pseudojaponica (Hayata) Yamamoto; D. japonica var. tenuiaxon Prain & Burkill; D. kiangsiensis R. Knuth; D. pseudojaponica Hayata.

Plants glabrous throughout. Petiole 2--4(--6) cm; leaf blade triangular-lanceolate or lanceolate to long elliptic, 3--11(--19) × (1--)2--5(--18) cm, membranous, basal veins 5--9, base sagittate or hastate to cordate, apex acuminate.

Mixed forests, herb communities, mountain slopes, valleys, along streams, roadsides; 100--1200 m. Anhui (S of Huai He), Fujian, Guangdong, Guangxi, S Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Zhejiang [Japan, Korea].