Plants 25-50(-100) cm tall, densely covered with mostly ± medifixed hairs. Stems branched, old parts long, ligneous; parts of current year 9-16 cm, densely covered with white and black hairs 0.4-0.8 mm. Leaves 3-7 cm; stipules 4-7 mm, adnate to petiole for ca. 1.2 mm, covered with white and predominantly black hairs; petiole 0.5-1 cm, like rachis sparsely to loosely white and black hairy; leaflets in 5 or 6(-8) pairs, 7-25 × 1-4(-10) mm, both surfaces or more rarely only abaxially sparsely covered with white and sometimes a few black hairs up to 1.2 mm. Racemes 4-5 cm, densely many flowered, at fruiting time elongating up to 10 cm; peduncle 4-7 cm, sparsely to loosely white and black hairy; bracts 3-4 mm, covered with mostly strongly asymmetrically bifurcate to basifixed, spreading, black and sometimes a few white hairs. Calyx at anthesis 10-11 mm, tubular, rather densely covered with ± symmetrically to strongly asymmetrically bifurcate, ascending, black and sometimes a few white hairs up to 1 mm; teeth 2.5-3 mm; calyx soon becoming inflated, at fruiting time ovoid, 12-13(-14) mm, ca. 5 mm in diam., loosely hairy. Petals pale yellow; standard obovate, 16-18 × ca. 7 mm, slightly constricted in middle, apex emarginate; wings 15-17 mm; keel 14-16 mm. Legume included in calyx, 8-9 mm, ca. 2.5 mm high (immature), compressed laterally, with a beak ca. 1 mm, 2-locular; valves densely covered with mostly basifixed, spreading, white and predominantly black hairs ca. 1 mm.
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