Herbs perennial, 10-250 cm tall. Stem branched, puberulent or glabrescent. Leaves paripinnate, 4-7 cm; stipules triangular, margin 3-5-toothed; leaflets 3-6-paired, oblong, (4-)10-20 × (1.5-)3-7 mm, apex obtuse and mucronate; veins dense, raised on both surfaces; tendril 2-or 3-branched. Raceme 6-7.5 cm, longer than leaf, sparsely 4-13-flowered. Calyx obliquely campanulate, ca. 6 mm, unequally toothed, rarely villous. Corolla red, through purple, to blue, or paler, sometimes with deeper venation and orange in throat, 10-11 mm; standard constricted at middle, subequaling wings and longer than keel. Ovary fusiform, ca. 3 mm; ovules 2-6. Legume oblong, flat, ca. 20 × 6 mm, glabrous, both ends narrowed. Seeds 1-4, oblong. Fl. Apr-Sep, fr. May-Sep.
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