Herbs annual. Stems ca. 40 cm, strigose, branched. Basal leaves ca. 6; petiole 6--7 cm; blade mostly ternate, ovate or broadly ovate, 1.8--2.6 × 1.6--2.9 cm, papery; central leaflet subpentagonal, petiolule 1--8 mm, base broadly cuneate, margin 3-partite, incised-lobulate; lateral leaflets smaller, subsessile or shortly petiolulate, oblique, unequally 3-cleft, simple, 3-lobed, to nearly 3-sect. Stem leaves long or shortly petiolate, ternate or 3-sect. Compound monochasium 2--5-flowered. Flowers ca. 1.8 cm in diam. Pedicel 1.5--4.5 cm, strigose. Receptacle pubescent. Sepals 5, narrowly ovate, ca. 6 mm, abaxially hispid. Petals 5, obovate, ca. 10 × 7 mm, nectary pit covered by a scale, apex rounded. Stamens numerous. Aggregate fruit ovoid, ca. 7 × 6 mm. Achene complanate, orbicular-obovate, ca. 2.5 × 2 mm, glabrous, verrucose along margin, narrowly marginate; style persistent, ca. 0.5 mm. Fl. May.

Recently naturalized in waste places. Shanghai [native to Europe].