Herbs, perennial, sometimes annual, 10-45 cm, glabrous or puberulent on cauline leaves and calyces. Stem branched from base, erect or ascending. Leaflets 5, apical 3 obovate to obovate-elliptic and obovate-lanceolate, 7-13 × 4-6 mm, base cuneate, apex rounded, basal 2 obliquely ovate, acute, subglabrous on both surfaces. Umbels 1-or 2(or 3)-flowered; peduncle 2-6 cm; sterile bract with 1-3 leaflets. Flowers 8-10 mm. Calyx 5-6 mm; teeth filiform, longer than tube, narrow part of upper calyx teeth more than half their length. Corolla light yellow, then becoming purple or red. Ovary linear; ovules 30-35; style 3-4 mm. Legume cylindric, 20-30 × 2-3 mm. Fl. May-Aug, fr. Jul-Oct.
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