Plants up to 30 cm tall, sparsely hairy or subglabrous, rarely ± densely hairy, with appressed white and in inflorescence also black hairs 0.15-0.35 mm. Stems subglabrous to sparsely hairy. Leaves 3-7.5 cm; stipules green, 3-4 mm, ± high vaginate-connate behind stem, glabrous or sparsely ciliate; petiole short, like rachis sparsely to loosely hairy; leaflets in (5-)7-9 pairs, elliptic, 4-8(-15) × 1.5-4(-8) mm, flat, abaxially sparsely hairy, adaxially glabrous, rarely hairy on both surfaces, apex subacute. Racemes at anthesis densely 8-12-flowered, at fruiting time distinctly elongated; peduncle 4-6 cm, sparsely to loosely white hairy; bracts 1-1.5 mm, sparsely ciliate. Calyx 3-4 mm, sparsely to loosely white and black hairy; teeth unequal, 0.5-1.2 mm. Petals blue or pale purple; standard obovate, ca. 10 × 5-6 mm; wings ca. 9 mm; keel ca. 8 mm. Legumes with a stipe distinctly longer than calyx tube, obliquely ellipsoid, 7-8 mm, ca. 3 mm high, attenuate at both ends, dorsally shallowly grooved, with a short beak, nearly 1-locular; valves at first rather densely hairy, when ripe only with scattered black hairs.
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