Rhododendron kaempferi in northern Kyushu held few overwintering leaves and the current shoots elongated after anthesis, whereas that in southern Kyushu had relatively many overwintering leaves and the current shoots elongated before anthesis. The regional specific foliar flavonoid pigments were detected in each azalea group. It was classified by the differences in growth characteristics and, flavonoid pigments, that R. kaempferi distributing in northern and southern Kyushu, although there are few morphological differences between them.