Slender annual, 3–25 cm high; stems simple or branching from base, ± densely pilose at least near base. Adult leaves with petioles 1–6 cm long; lamina reniform to ± semiorbicular in outline, 5–25 mm long, deeply trifid, with median segment entire or coarsely 3-dentate and lateral segments 2-lobed, each lobe up to 3-toothed. Lower pedicels (when fruiting) 7–30 mm long, upper flowers almost sessile. Sepals 3, 2–2.5 mm long, pilose below. Petals 0–2, oblong, c. 2–2.25 mm long, 1-or 2-nerved; nectary-scale above middle of petal, minute, semielliptic to semiorbicular. Stamens 4 or 5. Pistils 10–17. Receptacle glabrous. Achenes obliquely ovate, 3–5 mm long, virtually flat, ± stipitate; margin thickened, smooth; lateral faces with 15–20 long bristles each terminated by a short curved hair; beak triangular, slightly curved, up to half total achene length, terminating in a short hook.
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