Plants 30-70 cm tall, subglabrous, with few, appressed, mostly white hairs. Stems up to 5 mm thick, branched, glabrous or at base loosely hairy. Leaves 4-13 cm; stipules 3-15 mm, semicordate or obliquely ovate, glabrous or sparsely ciliate; petiole short, like rachis glabrous or sparsely hairy; leaflets in 15-20 pairs, widely obovate to obcordate, 1.5-7.5(-13) × 1-8(-12) mm, glabrous or abaxially and margins sparsely hairy, apex retuse to emarginate. Racemes at anthesis 4-10(-14) cm, very loosely 5-20-flowered, at fruiting time elongating to 14-22 cm; peduncle at anthesis (4-)6-12 cm, later strongly elongating, glabrous or sparsely hairy; bracts 1-2.5 mm, ciliate. Bracteoles 0.25-1 mm. Calyx 3.5-5 mm, glabrous; teeth unequal, 1-2 mm, sparsely white hairy. Petals pale yellow, often with violet tip when dry, nearly all of same length; standard widely obovate, 8-11 × 5.5-7 mm, apex retuse to slightly emarginate. Stigma densely hairy. Legumes with a stipe 5-8 mm, narrowly ellipsoid, 15-22 mm, 4-5.5 mm high, strongly compressed laterally, keeled ventrally, deeply grooved dorsally, nearly 1-locular, with a narrow septum; valves thin, glabrous.
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