Slender annual, 1–40 cm high, ± densely pilose at least in lower part; stems branched from base. Adult leaves: petioles 1–7.5 cm long; lamina trifoliolate or palmatisect, 0.5–2.5 cm long, with lobes cut into ± oblong to linear, acute segments mostly 0.5–1.5 mm wide. Flowers mostly pedicellate (upper flowers sometimes sessile); pedicels 3–15 mm long (to 5 cm in fruit). Sepals 3–5, elliptic to obovate, c. 2 mm long. Petals 2–4, ovate-spathulate, 1.5–2 mm long, yellow; nectary-lobe above middle of petal, minute, semi-elliptic or triangular. Stamens 4–6. Pistils 10–25. Receptacle glabrous. Achenes suborbicular, biconvex, 1.5–2 mm long, smooth or tuberculate; beak ± triangular, c. 0.2 mm long, obtuse or minutely hooked.
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