Japan Flora: Nearly glabrous shrub with flat prickles, the flowering branchlets rather elongate, on last year’s shoots, obtusely angled, sparingly prickly; leaflets 3-5, ovate-oblong to oblong, 2-5 cm. long, 1~3 cm. wide, doubly acute-toothed; flowers 1 or 2, white, 5-6 cm. across, double, the pedicels 5-10 cm. long, sparsely prickly; calyx­lobes broadly ovate, densely appressed-puberulent inside, thinly puberulent outside, abruptly mucronate or short-cau­date. May-June.

Chinese species long cultivated in our area.