Plants (0.5--)0.8--1.5 m tall, pubescent or glabrous. Stems branched. Basal and proximal cauline leaves withered at anthesis. Cauline leaf stipules membranous, irregularly lobed disally; petiole 3--7 cm; leaf blade 2-or 3-ternate, ca. 25 cm; petiolule 0.6--2 cm; leaflet blade ovate, (3--)6--8.5 × (1.3--)3--5 cm, herbaceous or papery, abaxially pubescent, base rounded or subcordate, apex acute or shortly acuminate, 3-lobed; veins raised abaxially. Inflorescence paniculate, many flowered. Pedicel 1.5--3 mm, pubescent. Sepals 4, early deciduous, elliptic, ca. 3 mm. Stamens many; filament base filiform, apex linear-oblanceolate, narrower than anther; anther narrowly oblong, ca. 1 mm, apex obtuse. Carpels 6--16; style circinate, 0.6--0.8 mm. Achenes sessile; body ovoid-fusiform, 1.5--3 mm; veins 7 or 8. Fl. Jun--Jul.
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