Plants 50--120 cm tall, mostly glabrous. Stems branched. Basal and proximal cauline leaves withered at anthesis. Proximal cauline leaf stipules semiorbicular, membranous, margin irregularly lobed; petiole ca. 6 cm; leaf blade 4-ternate, ca. 28 cm; leaflet blade ovate, rhombic-elliptic, obovate, or orbicular, 1--3 × 0.9--2.5 cm, herbaceous, base broadly cuneate, rounded, or subcordate, apex 3-lobed; veins raised abaxially, pubescent. Inflorescence paniculate, pubescent. Pedicel 3--5 mm. Sepals early deciduous, white or greenish yellow, narrowly ovate, 2.5--5 mm. Stamens many, 4.5--10 mm; filament base whitish, filiform, apex linear-lanceolate, narrower than anther; anther ca. 0.8 mm. Carpels 4--9; style ca. 1 mm, equaling ovary. Achene stipe 0.8--3 mm; body obliquely obovoid, 0.6--1.2 mm; veins ca. 4. Fl. Jun--Aug.
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