Plants 50–120 cm tall. Stems sulcate, glabrous. Stipules green, broadly semicordate, herbaceous, margin serrate; leaf blade pinnate, with 2–5 pairs of leaflets, both surfaces green and glabrous; terminal leaflet usually 7–9-lobed, slightly larger than lateral ones, lobes lanceolate, margin sharply irregularly serrate, apex acuminate; lateral leaflets resembling terminal one but less lobed. Inflorescence terminal, paniculate. Flowers bisexual, ca. 5 mm in diam.; pedicel glabrescent or sparsely pilose. Sepals ovate, apex obtuse. Petals white, obovate. Achenes erect, sessile, glabrous or hairy along ridge. Fl. and fr. Jun–Aug.