Plants 25-50 cm tall, vegetative parts glabrous. Stems solitary to mostly several, ca. 3 mm thick. Leaves 5-10 cm, nearly sessile; stipules ovate, 11-15 mm; leaflets in 4-7 pairs, narrowly elliptic or rarely elliptic, (7-)10-30 × (3-)4-10 mm, apex obtuse. Racemes densely 5-16-flowered; rachis black hairy; peduncle 4.5-12 cm, glabrous; bracts greenish, 5-9 mm, white and black ciliate. Calyx greenish, shortly tubular, 8-9 mm, glabrous; teeth unequal, 2 adaxial triangular, 1-1.5 mm, 3 abaxial narrowly triangular, 1.5-3 mm. Petals yellow, often blackish when dry; standard obovate to widely rhombic-obovate to sometimes wider than long, 16-17 × 8-11 mm; wings 15-16 mm; keel 15-16 mm. Stamen tube closed, monadelphous. Legumes with a stipe 7-8 mm, pendulous, ellipsoid, 1.8-2.5 cm, 6-8 mm high and ca. 4 mm wide, keeled ventrally and dorsally; valves papery, rather densely covered with appressed to subappressed black hairs 0.1-0.3 mm.
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