Slender ± erect annual, 2–40 cm high, glabrous or sparingly pilose; stems usually branched from base. Adult lower leaves with petioles 1.5–5 cm long; lamina trifoliolate, 0.7–2.5 cm long; leaflets ternately dissected into narrow-to linear-lanceolate lobes. Lower flowers usually pedicellate with fruiting pedicels to 3 cm long, upper flowers subsessile. Sepals 3–5, elliptic to obovate-oblong, 1.7–2 mm long. Petals 1 or 2, elliptic to obovate-spathulate, 1.5–2 mm long, whitish; nectary near middle of petal, with lobe ± semicircular, c. 0.2 mm long. Stamens 3–5. Pistils 6–20. Receptacle glabrous. Achenes suborbicular to broadly ovate, 2–4 mm long, strongly flattened, often twisted; faces smooth or tuberculate; margins smooth, slightly thickened, pale reddish brown; beak triangular, 0.3–1 mm long.
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