Japan Flora: Shrub, the branches with slender spreading not flattened bristlelike prickles, glandular-pilose and short-pubescent, the flowering branchlets elongate, 15-40 cm. long; leaflets 3 (sometimes 5 on vigorous shoots), the lateral ones slightly smaller, the terminal rhombicovate to broadly ovate or elliptic, 4-7 cm. long, 2.5-5 cm. wide, acuminate to acute, obtuse to rounded at base, irregularly and
coarsely acute-toothed, with dense short white-woolly hairs beneath, the petioles prickly and short-pubescent, sometimes
also with glandular hairs; inflorescence several-flowered, prickly, short-pubescent and glandular-pilose, the flowers white; calyx-segments narrowly ovate-deltoid, densely white- tomentose inside; petals spathulate, 5-7 mm. long; fruit globose, red, the fruitlets densely woolly-pubescent. June-July. Hokkaido. e. Asia and N. America.

f. concolor (Kom.) Ohwi. Leaves green, not white-tomentose beneath. Hokkaido. Temperate to cold regions of e. Asia.