Plants 45-70 cm tall, with mostly ± curly hairs 0.2-0.5(-0.8) mm. Stems several, branched, to 6 mm thick, loosely to densely covered with very short black and somewhat longer white hairs. Leaves 8-15 cm, subsessile; stipules 8-12 mm, sparsely to loosely white and black hairy; rachis loosely to rather densely mostly black hairy; leaflets in 15-19 pairs, narrowly elliptic, 8-23 × 3-8 mm, abaxially loosely appressed mostly white hairy, adaxially glabrous. Racemes 4-7 cm, very densely many flowered, later elongating up to 10 cm; peduncle 3-8 cm, ± densely black hairy; bracts linear-acute, 7-10 mm, predominantly black hairy. Bracteoles sometimes present, linear, 2-3 mm. Calyx 5-6 mm, mostly glabrous at base, toward teeth with a few black hairs or all over ± loosely predominantly black hairy; teeth unequal, 1-2.5 mm. Petals green-yellow; standard rhombic-obovate, 10-12 × 6-7 mm, apex emarginate; wings and keel 9-10 mm. Legumes with a stipe up to 2 mm, 10-12 mm, inflated, 2-locular, glabrous.
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