Plants 40--80 cm tall, glabrous. Stems simple or branched. Cauline leaves petiolate; stipules membranous; petiole 1--2.5 cm; leaf blade 3-ternate, 9--16 cm; petiolule 0.2--3 mm; leaflet blade broadly rhombic or broadly rhomboid-obovate, 1.8--4.5 × 2--5 cm, herbaceous, base rounded or broadly cuneate, apex 3-lobed; lobes crenate; veins raised abaxially. Inflorescence paniculate, 2.5--4.5 cm. Pedicel 4--9 mm. Sepals 4, early deciduous, greenish white, elliptic, ca. 2 mm. Stamens (10--)15--20; filament filiform distally, apex narrowly oblanceolate, as broad as anther; anther oblong, ca. 0.8 mm. Carpels 3--7; style straight or slightly apically recurved, 0.5--1.2 mm; stigma elliptic or linear-lanceolate. Achene stipe ca. 0.2 mm; body ovoid or broadly ellipsoid, ca. 3 mm. Fl. May--Jun.
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