Paris verticillata M. Bieb.

in Japan, Honshu, Mt. Fuji, May 2008 (picture 1)
in Japan, Honshu, Senjogahara, June 2010 (pictures 2 & 3)
in Japan, Honshu, Obuse, June 2010 (cultivated, picture 4)

Description in Fl. Taur.-Caucas. iii. 287