Plants 0.6--1.5 m tall, glabrous. Stems branched, robust, ca. 1 cm in diam. Basal leaves withered at anthesis. Stipules membranous; petiole 4.5--8 cm; leaf blade 3-or 4-ternate, 10--30 cm; leaflet blade obovate or broadly orbicular, 1.5--2.5 × 1.2--3 cm, herbaceous, base rounded-cuneate or subcordate, apex rounded to almost obtuse; lobes 3, entire or 1-or 2-toothed; veins flat on both surfaces or slightly raised abaxially. Inflorescence umbel-like, many flowered. Pedicel 4--17 mm. Sepals early deciduous, white or abaxially purplish tinged, elliptic, 3--3.5 mm. Stamens many, 6--9 mm; filament base filiform, apex oblanceolate, slightly narrower or broader than anther; anther ca. 1.2 mm, apex obtuse. Carpels 6--8; style persistent, 0.3--0.5 mm. Achene stipe 3--5 mm; body obovoid, 4--7 mm, broadly winged. Fl. Jul.
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