Plants annual, 10–40 cm, slender, pubescent. Root fusiform, 5–10 × ca. 2 mm, slender. Stem flexuose, little-branched, ascending (or creeping), densely pubescent along one side, 3–5-branched from the base. Basal and lower petioles 2–5 cm; blade simple or ternate, cordate-rounded; ultimate segments broad-ovate or ovate, 5–20 × 5–20 mm, both surfaces densely pubescent, margins crenate. Upper leaves smaller, sessile, 3-lobed, lobes ovate or lanceolate. Umbels 0.5–1 cm across, usually lateral on short peduncles; peduncles 0.2–1.5 mm; bracts and bracteoles absent; rays 2–3, 0.5–8 mm, very unequal, umbellules 2–3.5 mm across, 2(–4)-flowered; pedicels 0.2–1.5 mm, extremely unequal. Calyx teeth obsolete. Petals pale pink or purple, obovate or broad-ovate, apex with incurved lobule. Stylopodium low-conic or flat; styles ca. 1 × stylopodium. Fruit ovoid, ca. 1.8 × 1.3 mm, base cordate, surface glabrous; vittae 3 in each furrow, 4 on commissure. Seed face plane. Fl. May–Jul, fr. Aug.
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