Streptolirion volubile Edgew.

in China, Yunnan, Dali, June 1999 (picture 1)
in China, Yunnan, Yongsheng, June 2002 (picture 2)
in Sikkim, above Gangtok, July 2003 (pictures 3 & 4)

Description in Proc. Linn. Soc. i. (1845) 254; et in Trans. Linn. Soc. xx. (1846) 90. t. 2