Plants up to 30 cm tall, with ± appressed to more rarely ascending hairs 0.3-0.5 mm. Stems mostly several, slender, 4-30 cm, glabrous in lower part, toward top increasingly white hairy, below stipules mostly with spreading black hairs. Leaves 2.5-6 cm; stipules whitish membranous, high vaginate-connate behind stem, lower ones ca. 2 mm, glabrous, upper ones up to 5 mm, ciliate and sparsely hairy; petiole 0.5-1.5 cm, like rachis loosely white and black hairy; leaflets in 6-12 pairs, narrowly elliptic, 2-12 × 0.5-4 mm, both surfaces sparsely to loosely hairy or adaxially nearly glabrous, apex rounded. Racemes short, densely 3-15(-20)-flowered; peduncle 1-10(-15) cm, in lower parts sparsely white hairy, toward raceme increasingly black hairy; bracts whitish membranous, 2-3 mm, black ciliate. Calyx 7-8 mm, densely and predominantly black hairy, more rarely predominantly white hairy; teeth 1.5-3 mm. Petals violet; standard rhombic-elliptic, 14-15 × 7-8 mm, apex deeply incised to bilobed; wings 12-13 mm; keel 10.5-11 mm. Legumes ellipsoid, slightly compressed dorsiventrally, 5-7 mm, ca. 3 mm high and 4-4.5 mm wide, ventrally and dorsally shallowly grooved, nearly completely 2-locular; valves blackish brown when ripe, densely covered with white hairs up to 1.5 mm, inserted on small tubercles.
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