Plants 40-50(-100) cm tall, with appressed hairs 0.3-0.6(-1) mm. Stem sparsely to loosely covered with white and black or predominantly black hairs, glabrescent with age. Leaves 6-12 cm; stipules linear-subulate, 6-10 mm, spreading to reflexed, black ciliate; rachis sparsely to loosely covered with mostly black hairs; leaflets in 7-15 pairs, narrowly elliptic, 8-20(-30) × 3-8(-12) mm, abaxially ± light green and loosely appressed white hairy, adaxially dark green and glabrous, apex acute to slightly retuse with a distinct cusp ca. 0.5 mm. Racemes ca. 3 cm, densely many flowered, at fruiting time elongated and up to 6(-12) cm; rachis loosely to densely black hairy; peduncle 5-20 cm, loosely to rather densely black hairy, glabrescent with age; bracts whitish, linear-subulate, 5-7 mm, black ciliate. Calyx shortly tubular, 6-9 mm, loosely covered with white and black or only black hairs; teeth subulate, 3-5 mm. Petals yellow to greenish yellow or purplish, yellow when dry; standard oblong to elliptic, 11-13(-15) × 4-7 mm, rounded at apex; wings 10-11(-13) mm; keel 11-12(-14) mm. Legumes with a stipe 4-7 mm, erect or spreading, ellipsoid, compressed laterally, 1.3-1.7 cm, 6-8 mm high and 2.5-3 mm wide, sharply keeled ventrally, keeled to narrowly rounded dorsally, shortly acuminate at both ends; valves dirty brownish, sparsely to rather densely covered with subappressed black and white or only black hairs.
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