Plants 15-65 cm tall; hairs thin, white, in inflorescence also black. Stems simple or branched, erect, with ± appressed hairs 0.3-1 mm. Leaves 3-8 cm; stipules greenish, 4-8 mm; petiole 0.3-1.5 cm, ± appressed hairy; leaflets in 4-9 pairs, narrowly elliptic, 7-20 × 2-6 mm, abaxially sparsely to loosely covered and adaxially glabrous or sparsely covered with ± appressed hairs up to 2 mm. Racemes rather densely up to 25-flowered, elongating in fruit to 15 cm; peduncle 1-3.5 cm, hairy like stem; bracts whitish, linear, 3-4 mm, ciliate. Calyx campanulate, 5-7 mm, loosely covered with appressed to spreading long hairs; teeth subulate, unequal, lower 3 teeth 3.5-5 mm, upper 2 teeth only 1.5-2 mm. Petals violet; standard elliptic, 10-15 × 6.5-9 mm, abruptly contracted into short claw, apex deeply V-like incised; wings 8-9 mm; keel 10-13 mm. Legumes with a stipe 1.5-2 mm, linear, distinctly to nearly semicircular curved, 1.5-2.5 cm, 2-2.5 mm high and wide, keeled ventrally, deeply V-like grooved dorsally, with a beak 1.5-2 mm, completely 2-locular; valves gray-brown, loosely covered with nearly spreading hairs 0.3-1 mm.
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