Japan Flora: Rhizomes short, with thickened roots; stems 30-80 cm. long, from a decumbent base, retrorsely pilose; lower cauline leaves petiolate, 5-angled, orbicular, somewhat depressed, cordate at base, 5-10 cm. wide, deeply 5-parted nearly to the base, the lobes rhombic-obovate, 2-fid again and with a few deep incisions, obtuse to subacute, spreading-pilose; stipules free or connate, brown, membranous; flowers rose-purple, 2.5-3 cm. across; sepals with long spreading hairs; petals densely white hairy near base inside; free portion of style about 5 mm. long. July-Aug.
Hokkaido, Honshu (Mount Ibuki in Oomi, and eastvv.); rather variable.
var. nipponicum Nakai. Less pubescent with shorter, appressed hairs on stems and petioles; sepals usually without long hairs. Rather common in high mountains of Honshu (centr. and n. distr.).
var. pseudopalustre Nakai. Similar to the preceding variety but the leaves shallowly incised, the lobes broader; sepals often sparsely long spreading-hairy. Near seashores of Hokkaido and n. di str. of Honshu. Kuriles.