Asarum caulescens Maxim.

Distribution : Japan (Honshu, Shikoku, Kyushu), China (Guizhou, Hubei, Gansu, Shaanxi, Sichuan)
Pictures 3 to 7 in Japan, Shikoku, Omogo, May 2008
Picture 8 in Japan, Honshu, Nikko, June 2010
Picture 9 in Japan, Honshu, Ofuna Botanical Garden, May 2008