Japan Flora: Shrub, the branches with rather stout slightly flattened prickles, the flowering branchlets slightly elongate, prickly and short-pubescent; leaf­lets 3, glabrous to slightly appressed-pubescent on upper side, with short white tomentum beneath, duplicately incised-ser- rate, abruptly acuminate, the lateral ones obliquely obovate, the terminal larger, ovate-orbicular, 6-12 cm. long, 4-8 cm. wide, the lateral nerves sparingly ascending-pilose beneath, the petioles prickly and pubescent; inflorescence 5- to 10-flowered, densely white-pubescent, the pedicels short; calyx-lobes broadly lanceolate, caudate-acuminate; petals erect, about half as long as the calyx-segments, 4-5 mm. long, broadly obovate; fruit globose, purplish black) the fruidets nearly glabrous; stones prominently pitted. June-July.

Hokkaido, Honshu, Shi­koku, Kyushu. China.

var. adenothrix Momiyama. Stems, petioles, and inflorescence with short glandular hairs.  Hon­shu (Mutsn Prov.).