Plants 10-40 cm tall, with subappressed hairs 0.2-0.3 mm. Stems sterile or flowering, ascending to erect, 5-30 cm, sparsely to loosely white hairy. Leaves 3-10 cm; stipules 7-12 mm, often amplexicaul but free from each other, sparsely white ciliate; petiole 0.5-1 cm, rachis sparsely to loosely hairy like stem; leaflets in 5 or 6 pairs, narrowly elliptic, 6-17(-25) × 2.5-4(-6) mm, abaxially sparsely hairy, adaxially glabrous, apex acute to subobtuse. Racemes 10-18-flowered; peduncle 5-16 cm, sparsely white hairy in lower part, densely black hairy in upper part; bracts whitish green membranous, 5-10(-14) mm, sparsely black hairy. Calyx 8-9 mm, loosely black hairy; teeth 2-3.5 mm. Petals violet; standard ovate, 13-16 × 6.5-7 mm, deeply cleft up to 1/4; wings 10-13 mm, limbs deeply bifurcate (up to 1/3 of length); keel 7-9 mm. Legumes sessile, widely inflated ovoid, 6-11 mm, slightly keeled ventrally, rounded dorsally, 1-locular; valves glabrous.
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