Plants 10-60 cm tall; hairs appressed, ± medifixed, in vegetative parts mostly only white, 0.3-0.6 mm. Stems mostly several, sometimes branched, prostrate to ascending or erect, sparsely hairy to glabrescent. Leaves 3-15 cm; stipules 4-10 mm, behind stem vaginate-connate to middle, sparsely hairy; petiole very short or up to 2.5 cm, like rachis sparsely to loosely hairy; leaflets in 6-16 pairs, narrowly elliptic, 5-25 × 2-7 mm, both surfaces sparsely to loosely hairy or adaxially subglabrous to glabrous, apex subacute to obtuse. Racemes ellipsoid, many flowered; peduncle 3-14 cm, sparsely hairy with white or black hairs; bracts 2-4 mm, with few black and white hairs. Calyx 5-7(-8) mm, sparsely to loosely, more rarely rather densely, covered with black and white or only black hairs 0.2-0.3 mm; teeth 1-3.5 mm. Petals purple to bluish violet, mostly yellow when dry; standard elliptic to slightly rhombic-elliptic, 12-16 × 5-6 mm, emarginate; wings 10-13 mm; keel 8-10 mm. Legumes sessile, distinctly curved, 20-30 mm, ca. 2 mm high and wide, 2-locular; valves loosely to rather densely covered with flexuous subappressed white hairs or appressed white and shorter black hairs.
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