Slender annual, 2–35 cm high, sparingly to ± densely pilose on lower part; stems usually branched near base. Adult leaves with petioles 2–5 cm long; lamina palmatisect or trifoliolate, 4–15 mm long, the median segment 3-dentate, the lateral ± 2-fid with 3 or 4 teeth to each lobe. Flowers leaf-opposed, subsessile, the lower ones occasionally shortly pedicellate with fruiting pedicels to 1.5 cm long. Sepals 3 or 4, oblong to elliptic, c. 2 mm long, pilose below. Petals 0-2, elliptic-to linear-spathulate, 1-2 mm long; nectary lobe above middle, minute, ± triangular, obtuse. Stamens 3–6. Pistils 6–20. Receptacle glabrous. Achenes suborbicular to obovate, 1.3–2.5 mm long, virtually flat; lateral faces each bearing 7–25 conical tubercles terminated by a recurved bristle; beak short-triangular, 0.3–0.5 (–1) mm long, ± acute.
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