Herbs annual. Stems 5--28 cm, glabrous, branched. Basal leaves 6--9; petiole 3.4--12 cm, subglabrous; blade 3-lobed, broadly ovate or orbicular-ovate, 1.6--5.5 × 1.8--4.2 cm, papery, glabrous, base subtruncate or truncate-cuneate; central lobe rhombic-obtrapeziform, 3-lobed or few dentate; lateral lobes obliquely ovate, unequally 2-lobed, incised-dentate. Lower stem leaves similar to basal leaves; upper ones shortly petiolate, broadly ovate. Flowers solitary, leaf-opposed, 1--1.6 cm in diam. Pedicel 1--3 cm, glabrous or pilose. Receptacle pilose. Sepals 5, narrowly ovate, 5--6 mm, abaxially sparsely pilose. Petals 5, narrowly obovate, 3--8 × 2.5--4 mm, nectary pit covered by a scale, apex rounded. Stamens numerous. Aggregate fruit subglobose, ca. 1.2 cm in diam. Achene complanate, elliptic or obovate, 4--5 × ca. 3 mm, glabrous, narrowly marginate, spiny, spines 0.5--1 mm; style persistent, ca. 2 mm. Fl. Mar--Apr.

Naturalized in grassy places, paddy fields, yards. Anhui, S Jiangsu, Zhejiang [native to W Asia and Europe].