Trillium smallii Maxim.

Distribution : Japan (Hokkaido, Honshu, Shikoku, Kyushu)
Pictures 1, 2, 3 & 4 in Japan, Honshu, Mt. Higashidate, June 2010
Pictures 5, 6, 7 & 8 in Japan, Honshu, Gomi Pond, June 2010