Purple morning glory
Ipomoea purpurea (L.) Roth [Convolvulaceae]
Maruba-asagao (マルバアサガオ, 丸葉朝顔)
Life form: annual vine
Distribution: native to Central America (gardening plant in Japan)
Habitat: sometimes escaped from gardening (in the case of Sapporo)
Leaf: heart-shaped
Ipomoea purpurea in Hokkaido
[Left] a patch. [Center] close-up of a heart-shaped leaf (and a flower). [Right] a flower. At a roadside of N19/W2, North Ward, Sapporo, on October 22 2010. Probably escaped from gardening.