Annual herbs, 15-25(-40) cm. Stems prostrate or ascending, subquadrangular, sparsely pilose. Leaves 3-foliolate; stipules subhastate, 5-6 mm; leaflets obovate to obovate-triangular, 6-15 × 3-8 mm, pilose at least on midrib abaxially, glabrous adaxially, lateral veins 6-9 pairs, base cuneate, margin denticulate in upper 2/3, apex truncate. Flowers 2-5 in subumbellate heads; peduncles undeveloped, but sometimes to 3-5 mm. Corolla yellow, 4-5 mm; standard longer than wings and keel. Ovary linear; ovules numerous; style short and flat. Legume cylindric, 20-30 × 1-1.5 mm, appressed pubescent, veins reticulate. Seeds numerous, brown, oblong to ovoid, ca. 2 × 1 mm, warty. Fl. Apr-Jun, fr. May-Jul.
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