Plants ca. 60 cm tall, glabrous. Stems branched, erect, sulcate or sometimes smooth. Leaves both basal and cauline; petiole 2--9 cm; leaf blade 2-or 3-ternate, 10--18 cm; leaflet blade orbicular or cuneate-obovate, 1--2.8 × 1--4.6 cm, papery, base cordate, margin 6--9-lobed; lobes crenate. Inflorescence terminal or axillary, pleiochasial, flat topped, many flowered. Sepals 4, early deciduous, whitish green, ca. 3.5 mm. Stamens many; filament whitish, 3--4 mm, apex strongly dilated, slightly narrower than anther; anther ca. 1 mm, apex obtuse. Carpels 4--15; style 0.2--0.3 mm; stigma conspicuous. Achenes sessile; body narrowly cylindric-ovoid, 1--3 mm; persistent style straight, 0.2--0.3 mm; veins 6--8, stout. Fl. Aug--Sep.
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