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1b. Dioscorea nipponica subsp. rosthornii (Prain & Burkill) C. T. Ting in C. Pei et al., Acta Phytotax. Sin. 17(3): 70. 1979.
柴黄姜 chai huang jiang
Dioscorea nipponica var. rosthornii Prain & Burkill, J. Proc. Asiat. Soc. Bengal 10: 14. 1914; D. nipponica var. jamesii Prain & Burkill.
Rhizome with cork layer persistent. Stem robust. Male flowers pedicellate.
* Warm-temperature transitional areas; 1000--1800 m. S Gansu (Tianshui Shi), Guizhou, Hubei, S Shaanxi (S of Qin Ling).
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