Japan Flora: Shrub; branchlets scarcely angled, short-pubescent; leaves ovate to broadly so, 2-35 cm. long, 15-2 cm. wide, obtuse to acute, serrulate, appressed-pubescent beneath, the petioles 3-7 mm. long, appressed-pubescent; inflorescence sessile, umbellate, 3- to 5-flowered, with few green bracts at base; pedicels 2-4 cm. long, thinly pubescent; flowers white, double, about 10 mm. across; Apr.-May. A Chinese shrub, cultivated in gardens. The nomenclatorial type is based upon the double-flowered phase in cultivation.   

f. simpliciflora Nakai. Flowers single. The indigenous wild phase of Formosa, Korea, and centr. China.