Plants 18--80 cm tall, glabrous. Stems branched. Leaves all basal; petiole ca. 10 cm; leaf blade 3-or 4-ternate or-pinnate, 5--15 cm; petiolule 5--7 mm; leaflet blade narrowly oblong, lanceolate, narrowly ovate, rhombic, obovate, or orbicular, 0.3--1.2 × 0.2--1.5 cm, herbaceous, base cuneate or rounded-cuneate, apex 3-lobed; lobes entire; veins flat on both surfaces. Inflorescence flat topped, few or many flowered. Pedicel 5--25 mm. Sepals 4, early deciduous, white, ovate, 3--5 mm. Stamens many, 5--12 mm; filament oblanceolate, broader than anther; anther narrowly oblong, 0.7--1.5 mm, apex obtuse. Carpels 4--13; style ca. 1 mm. Achenes sessile; body ovoid, 4--6 mm; veins ca. 8. Fl. Jun--Jul.
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