Herbs perennial, 50-90 cm tall. Stem erect. Leaves paripinnate, 2-3.5 cm; stipules semihastate or lanceolate, 8-13 × 3-5 mm, margin toothed; leaflets 2-or 3(-5)-paired, lanceolate to narrowly elliptic, 40-85 × 15-35 mm, both surfaces puberulent, apex often acuminate, mucronate; lateral veins 5-8-paired, extending to margin; tendril absent, replaced by a mucro. Raceme unbranched, 2-5 cm, subequaling or longer than leaf, 5-18-flowered; pedicels ca. 1.5 mm; bracts persistent at base of pedicels. Flowers ca. 15 mm. Calyx obliquely campanulate. Corolla purple-red, purple, or blue; standard violin-shaped or suboblong, subequaling wings and longer than keel. Ovary long stalked, linear; ovules ca. 5. Legume oblong, 40-50 × 7-8 mm, both ends acuminate. Seeds 1-4. Fl. Apr-Aug, fr. Jun-Sep. 2n = 14*.
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