Stachyurus praecox Sieb. & Zucc.

Distribution : Japan (SW.Hokkaido, Honshu, Shikoku, Kyushu)
Picture 1 in Japan, Honshu, Road to Niigata, June 2010
Picture 7 in Japan, Honshu, Kitakata, June 2010
Pictures 8 & 9 in Japan, Honshu, Kawaguchi Lake, May 2008