Plants 0.6--2 m tall, glabrous. Stems branched. Basal leaves withered at anthesis. Stipules semiorbicular, margin lobed or entire; petiole 1.4--8 cm; leaf blade 3-or 4-pinnate, ca. 40 cm; leaflet blade orbicular-ovate, obovate, or elliptic, 0.5--3 × 0.3--2(--2.5) cm, herbaceous, base rounded or cuneate, apex obtuse or acute, 3-lobed; lobes entire or 1--3-toothed; veins flat or raised abaxially. Inflorescence paniculate, 15--40 cm. Pedicel 8--25 mm. Sepals 4(or 5), purplish tinged, oblong or long elliptic to ovate or broadly so, 6--14 × 2.2--7 mm. Stamens many, 5--7 mm; filament filiform, dilated distally; anther oblong, 0.1--1.8 mm, apex mucronate, mucro 0.01--1.5 mm. Carpels 15--22; style short; stigma inconspicuous. Achene stipe erect, 1--3 mm; body obliquely obovoid, 5--8 × 2.5--3.2 mm; veins ca. 8. Fl. Jun--Sep.
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