Plants perennial. Rhizome ca. 8 mm in diam. Stems (10--) 20--40(--58) cm tall, usually branched from base, glabrous, basally with membranous scales. Stem leaves with petiole to 7 cm basally on stem, shortly petiolate or sessile toward stem apex; leaf blade pentagonal to triangular-ovate, 3.5--9 × 3.5--10 cm, 3-sect, glabrous; leaflets 2 × pinnately divided; ultimate segments narrowly ovate to lanceolate, margin toothed and teeth acute. Flowers (1.5--)1.8--2.8 cm in diam. Sepals 5--7, elliptic, 5--8 mm, glabrous, rarely ciliate. Petals 7--14, white, sometimes tinged with purple, obovate-oblong to oblong, 1--1.4 cm, apex rounded to ± acute. Stamens as long as sepals. Ovary sparsely puberulous. Styles very short; stigma globose. Achenes obovoid, 3--4 mm, sparsely pubescent. Fl. Apr--Aug.
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