Plants 15--65 cm tall, glabrous. Stems branched or simple, smooth. Cauline leaves 7--10, shortly petiolate or sessile; leaf blade 3-ternate; leaflets sessile, broadly rhombic or broadly rhombic-triangular, 1.1--2.5 × 0.6--2.4 cm, papery or thinly leathery, base cuneate to rounded or subcordate, apex rounded, 3-lobed; lobes crenate; veins raised on both surfaces. Inflorescence monochasial, simple or compound. Pedicel slender, 0.8--1.8 mm. Sepals 4 or 5, deciduous, white or pinkish, ovate, 4--8 × 2.5--4 mm. Stamens 4--7 mm; filament narrowly linear; anther narrowly oblong, apex obtuse. Carpels 10--25; stigma persistent, ca. 0.3 mm. Achene stipe ca. 0.4 mm; body ellipsoid, laterally compressed, ca. 3 mm; veins ca. 8. Fl. Jun--Aug.
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