Japan Flora: Shrub, the branches with stout often curved flattened prickles, the flowering branchlets glabrous; leaflets rather thick, 5-7, glabrous on both sides or slightly pubescent on nerves beneath, with awn-tipped irregular teeth, the lateral leaflets ovate, acute to obtuse, the terminal leaflet slightly larger, rhombic-ovate to suborbicular, 4-6 cm. long, 3-6 cm. wide, very acute, often 3-lobed; corymbs terminal and axillary, rather densely short-pubescent; calyx thick, the lobes broadly lanceolate, caudate-acuminate, densely white-tomentose inside; petals shorter than the calyx-segmcnts, obovate, about 5 mm. long, white, erect. 

Rarely cultivated. Korea and China.