Clematis montana Buch.-Ham.

in Nepal, Langtang Park, ca.3800m, June 2000 (pictures 1, 2 & 4)
in China, Sichuan, Mt.Emei, June 2002 (picture 3)
in Sikkim, Tsomgo lake, July 2003 (pictures 5, 6 & 7)
in China, Sichuan, above Wolong, June 2002 (form with pink-banded sepals, pictures 8 & 9)