Japan Flora: Delicate slender herb, without prickles; stems filiform, much-elongate, creeping, rooting from the nodes, scattered-pilose while young; flowering branchlets in axils of radical leaves, 5-12 cm. long, erect, 1- or 2-leaved; leaves radical, 3-foliolate, green, mem­branous, thinly appressed-pilose on upper side, nearly glabrous beneath, the terminal leaflet slightly larger, rhombic-ovate, 1.5-3 cm. long, 1-2 cm. wide, obtuse to rounded at apex, cuneate at base, double or incised-toothed, the lateral leaflets often 2-cleft or divided, the petioles thinly short-pubescent, rarely also witli short glandular hairs, the stipules elliptic to ovate, brown, scarions, broadly obtuse to rounded at apex, 2-4 mm. long; scapes 3-10 cm. long, short-pnbescent, sometimes with glandular hairs; flowers solitary; calyx 8-12 mm. long, the lobes lanceolate, often toothed on upper margin, mem­branous; petals white, 6-7 mm. long; fruitlets few, yellowish red, glabrous; stones 35 mm. long, raised reticulate on the upper half. June-July. Damp coniferous woods in moun­tains.

Hokkaido, Honshu (centr. and n. distr.).  N. Amer­ica