Apios delavayi var. pteridietorum Handel-Mazzetti (1933: 580)

Zhang, Fan, Feng, Si, Zhou, Jianjun, Zhang, Rong, Liu, Linhan, Yang, Chengzi, Yu, Xunlin & Pan, Bo, 2018, Apios chendezhaoana (Fabaceae), an overlooked species and a new combination from China: evidence from morphological and molecular analyses, Phytotaxa 371 (1), pp. 1-16 : 10

Apios delavayi var. pteridietorum Handel-Mazzetti (1933: 580) .

Type:— CHINA. Yunnan: Salween, H. Handel-Mazzetti 8990 (holotype WU! Isotype E!).

Flowers yellowish violet, light purple, or dark purple. This variety represents A. delavayi populations west of the Mekong-Salween Divide.

Distribution and habitat: —This variety is distributed in China (Xizang and Yunnan) and India (Assam). It grows in pine forests, mixed forests or thickets at elevations between 1700–3500 m above sea level.

Phenology: —Flowering from June to September; fruiting from July to October.

Specimens examined:— CHINA. Xizang: Baiba, 17 June 1952, Bu-Qiu Zhong 6643 (PE). Bomi, between Bomi and Tongmai, 2600–2800 m, Su-Gong Wu et al. 105962 (KUN). Chayu, Xialun, 1860 m, 31 July 1980, Zhi-Cheng Ni et al. 942 (PE). Chayu, Tongmai to Lulang, 2210 m, 27 July 1965, Yong-Tian Zhang & Kai-Yong Lang 939 (PE). Gorge of the Tsangpo, 8000–10000 ft, 19 July1924, F.K. Ward 5961 (E). Linzhi, Dongjiu to Chayuan, 2900 m, 17 June 1972, Xizang Medicinal Plants Team 3466 (PE). Pome, near Showa, Satang, 7500 ft, 19 September 1947, Ludlow et al. 13192 (E). Salween-Kiuchiang Divide, July 1919, G. Forrest 19321 (E). Salween valley, 10000 ft, 22 October 1917, F.K. Ward 5420 (E). Yunnan: Deqin, 3000 m, July 1935, Qi-Wu Wang 64738 (PE). Dulongjiang, Longdang to Longjigeng, 1900–2100 m, 3 September 1982, Qingzang Team 9873 (KUN). Gongshan, Yu’en, 3300 m, 25 August 1940, Feng 6898 (PE). Kiukiang Valley, Taron, Chiengen, 1700 m, 26 July 1938, T.T. Yü 19419 (E, PE). INDIA. Assam: Di Chu Gorge, 7000 ft, 6 August 1950, F.K. Ward 20115 (E).