Plants 30-75 cm tall, covered with appressed to ascending hairs 0.3-0.5 mm. Stems 10-25 mm in diam., sparsely to loosely covered in lower part with white hairs, in upper part with increasingly blackish brown hairs, and in inflorescence region only with black hairs. Leaves 3.5-11.5 cm; stipules 4-6 mm, glabrous or sparsely to loosely hairy, at margins more densely hairy; petiole very short, like rachis sparsely to loosely hairy; leaflets in (4 or)5-12 pairs, 4-21.5 × 1.5-6 mm, abaxially sparsely to loosely hairy, adaxially glabrous. Racemes 1-2 cm, densely, later somewhat more loosely, 3-11-flowered; peduncle 4-15 cm, often curved, mostly with brownish black hairs, bracts 4-8 mm, nearly glabrous to loosely or at margins more densely black hairy. Bracteoles 0.5-4 mm. Calyx 7-12 mm, sparsely to loosely or densely mostly appressed black hairy; teeth 4-9 mm, often ± strongly curved. Petals greenish yellow to sulfur-yellow; standard 14-17 × 12-15 mm; wings 12-15 mm; keel 12-15 mm. Legumes with a stipe 2-3 mm, 16-22 mm, 3.5-4.5 mm high, with a beak 2-3 mm, 1-locular, glabrous or sparsely to loosely covered with white to blackish brown hairs.
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