Persicaria runcinata (Buch.-Ham.) Masam.

in China, Sichuan, Wolong, june 2004 (picture 1)
in Nepal, Langtang Park, june 2000 (pictures 2 & 3)
in China, Yunnan, near Tuguancun, june 2002 (picture 4)

Description in Bot. Mag., Tokyo, 1937, li. 234