Herbs perennial, 80-100 cm tall. Stem erect, glabrous, wingless. Leaves with simple or branched tendril; stipules obliquely ovate, toothed, on upper leaves often lanceolate, entire; leaflets (2 or)3-or 4(or 5)-paired, ovate to ovate-lanceolate, 35-55(-65) × 13-20(-35) mm, glabrous, with reticulate veins. Raceme shorter than or subequaling leaf, 9-11(-13)-flowered. Calyx campanulate, 7-8 mm, glabrous, shortly toothed; longest tooth shorter than tube, 1.5-2 mm. Corolla pink or purple, 1.8-1.9 cm; standard orbicular, with claw; wings obovate, auriculate at base. Ovary linear, glabrous. Legume brown, linear, 5.5-8 cm. Seeds elliptic, ca. 5 mm, smooth. Fl. May-Jun, fr. Jul-Aug.
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