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1a. Dioscorea nipponica subsp. nipponica
穿龙薯蓣 (原亚种) chuan long shu yu (yuan ya zhong)
Dioscorea giraldii R. Knuth.
Rhizome with cork layer readily peeling or flaking off. Stem slender. Male flowers sessile.
Mixed forests, scrub forests; 100--1700 m. Anhui, Gansu, Hebei, Heilongjiang, Henan, N Jiangxi (Lu Shan), Jilin, Liaoning, Nei Mongol, Ningxia, S Qinghai, Shaanxi (N of Qin Ling), Shandong, Shanxi, NW Sichuan, N Zhejiang [Japan, Korea, Russia].
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