Plants weakly rhizomatous, 7–15 dm. Rhizomes horizontal, stout, 10–15 mm wide, internodes 1–4 cm; root tubers absent. Stems finely puberulent distally. Leaves: basal 1 or 2, deciduous by flowering; stipules round, 1–1.5 cm diam., base not auriculate; lateral leaflets in 1–3 pairs or lacking, remote, ovate to elliptic, to 1 cm, margins serrate; terminal leaflets round, 6–16 cm diam., palmately 5–7-lobed, lobes ovate to oblong-lanceolate, margins doubly serrate, apex acute to acuminate, surfaces short-appressed hairy at least on veins. Inflorescences 100+-flowered; branches and pedicels densely short-appressed hairy, hairs straight. Flowers: hypanthium nearly flat, saucer-shaped; sepals (4–)5(–6), green, narrowly triangular, 4–6 mm, margins ?often serrate?, usually with midrib, abaxially puberulent, adaxially glabrous; petals (4–)5(–6), white, in buds sometimes marginally pink, oblanceolate, 10–15 mm, not clawed, base broad, margins entire; stamens white, about equal to petals. Achenes 7–12, flattened, lanceolate, straight, 6–7.5 mm, sutures densely ciliate, faces sparsely hairy; stipes 1–2 mm; styles 1.5–2 mm.
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