Plants (30--)50--100 cm tall, glabrous or glandular pubescent. Stems branched. Basal leaves withered at anthesis. Cauline leaves petiolate; stipules brown, 2--3 mm wide, membranous, margin fimbriate; petiole ca. 5.5 cm; leaf blade 3-or 4-ternate, 6--25 cm; petiolule 0.5--1.4 mm; leaflet blade obovate, elliptic, or orbicular, 1.2--2.5 × 1--1.8 cm, papery, base broadly cuneate, rounded, or subcordate, margin toothed, apex 3-lobed; veins raised abaxially. Inflorescence pleiochasial, few or many flowered. Pedicel 3--7(--10) mm. Sepals 4, early deciduous, 2.5--3 mm. Stamens many, 2--5 mm; filament base filiform, apex oblanceolate, broader than anther; anther 0.6--1 mm. Carpels 8--35; style circinate, 0.6--2 mm. Achene body narrowly ovoid, 2--3 mm; veins 6--8. Fl. Apr--Jul.
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