Herbs perennial, 80-120 cm tall. Stem erect, much branched, glabrous, wingless. Leaves 10-30 cm, mucronate or with a simple tendril at apex; stipules semisagittate, 8-15 × 2-5 mm; leaflets 3-8-paired, narrowly elliptic or narrowly ovate, 30-70 × 10-30 mm, glabrous, with pinnate veins, margin entire. Raceme subequal or shorter than leaf, ca. 10-flowered. Calyx campanulate, unequal; longest tooth ca. 1/5 length of tube. Corolla yellow, 14-18 mm; standard broadly obovate, with claw; wings shorter than standard, obovate, subequaling keel. Ovary linear, ca. 11 mm, purple-brown glandular hairy; style curved inward. Legume light brown, linear, 6-8 cm. Seeds brown, oblong. Fl. May-Jul, fr. Jun-Sep.
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