Japan Flora: Small tree with slender branches, ascending-pubescent while young; leaves obovate, 3-8 cm. long, duplicate-toothed, with 7-10 pairs of lateral nerves, the petioles pubescent; calyx-tube slightly inflated below, short-pubescent; style usually glabrous. Mar.-Apr. Alleged hybrid of Nos. 9 and 10. Cultivated only, unknown in the wild.
var. autumnalis Makino. Differs in having double flowers, appearing in spring and in autumn. Cultivated only, unknown in the wild.