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History and distribution of the Chinese yam in China. (a) Shen Nong “the Divine Farmer”; (b) Shen Nong Ben Cao Jing “Divine Farmer’s Classic of Materia Medica”; (c) Li Shizhen; (d) Ben Cao Gang Mu “Compendium of Materia Medica”; (e) Chinese yam cultivar distribution; (f) Xichangmao Shanyao in Jilin province; (g) Huai Shanyao in Henan province; (h) Jintian Huai Shanyao in Guangxi province.
