Acer palmatum Thunb.

in Japan, Honshu, Kanazawa, June 2010 (picture 1)
in Japan, Honshu, Nagano, June 2010 (picture 2)
in Japan, Honshu, Kyoto, May 2008 (pictures 3 to 9)
in Japan, Honshu, Tokyo, June 2010 (pictures 10 to 17)

Description in Fl. Jap. 162