Plants 30-90 cm tall. Stems at base 3-7 mm thick, glabrous or more rarely sparsely to very sparsely appressed hairy. Leaves 7-15 cm, nearly sessile; stipules 1.2-2 cm, glabrous or ciliate; leaflets in 4-7 pairs, narrowly ovate to ovate, 2-6 × 0.8-3.5 cm, glabrous or sparsely hairy abaxially. Racemes 6-9 cm, loosely to rather densely many flowered; peduncle 5-14 cm; bracts greenish, 6-9 mm, glabrous or sparsely ciliate, soon falling. Calyx shortly tubular, 8-11 mm, sparsely covered with very short appressed black hairs or nearly glabrous; teeth widely triangular, 0.5-1.5 mm, mostly black hairy. Petals yellow; standard obovate to widely obovate, 15-25 × 7-10 mm; wings 14-22 mm; keel 14-20 mm. Legumes with a stipe 8-10 mm, narrowly ellipsoid, 2.5-4.5 cm, 4-6 mm high and 5-8 mm wide, slightly keeled ventrally, slightly widely grooved dorsally, acuminate at both ends; valves papery, loosely covered with short appressed black hairs, rarely glabrous when fully ripe.
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