Plants (35--)45--110 cm tall, glabrous. Stems branched distally. Basal leaves withered at anthesis. Stipules narrow; petiole 4.5--6 cm; leaf blade 2-or 3-ternate, ca. 30 cm; petiolule 1.5--4 cm; leaflet blade broadly ovate or rhombic, papery, base rounded or subcordate, apex entire or 3-lobed; lobes obtuse or acute at apex; veins raised abaxially. Inflorescence paniculate, 20--40 cm. Pedicel slender, 3--7 mm. Sepals early deciduous, white, broadly elliptic, 3--3.5 mm. Stamens many; filament 5--7 mm, as broad as anther; anther oblong, 1--2 mm. Carpels 3--6; style circinate, equaling ovary. Achene body narrowly ovoid, 5--6 mm; veins ca. 10. Fl. Jul--Aug.
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