Holboellia angustifolia Wall.

in Darjeeling, Manebhanjan, july 2003 (picture 2)
in Sikkim, near Gangtok, july 2003 (picture 1)
in China, Sichuan, Kangding, september 2005 (pictures 5 & 6)

Description in Tent. Fl. Nep. 25. t. 17