Herbs, perennial or annual, with a taproot, almost glabrous or rarely with spreading trichomes. Stem erect or ascending. Leaflets: apical 3 oblanceolate to linear, basal 2 obliquely ovate to lanceolate; terminal leaflet (3-)4-7 × as long as leaf rachis. Umbels 1-3-flowered; peduncle 1-6(-10) cm. Flower 6-8 mm. Calyx 4.5-5.8 mm; teeth ± equaling tube, narrow part of 2 upper calyx teeth less than half their length. Corolla yellow, usually with rose, red, or purple parts. Style 3-4 mm. Legume straight, almost cylindric or slightly compressed, 15-30 × 1.5-4 mm.
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