Plant hairs white, at nodes and in inflorescence also black, 0.1-0.3 mm. Stems 2-40 cm, simple or branched at base, rather densely appressed to partly spreading hairy, often glabrescent with age. Leaves 3-10 cm; stipules greenish membranous, 3-6 mm; petiole 0.5-1.5 cm, like rachis with appressed to ascending hairs; leaflets in 6-9 pairs, narrowly elliptic to narrowly oblong, 4-18 × 1-5 mm, abaxially mostly loosely subappressed hairy, adaxially glabrous, apex mostly distinctly and widely emarginate. Racemes at anthesis rather densely 3-9-flowered, later strongly elongating and up to 7 cm; peduncle 3-9 cm, hairy like stem; bracts whitish membranous, 1-2 mm, hairy. Calyx campanulate, 3-4 mm, black or black and white hairy; teeth subulate, 1-1.5 mm. Petals bluish to pale violet; standard narrowly oblong to narrowly elliptic, 6-10 × 2.5-3 mm, apex distinctly incised; wings 5-7 mm; keel 4.5-6 mm. Legumes seen from adaxial side narrowly acuminately ovate, 1.5-2 cm, 3-3.5 mm high and 6-7 mm wide, keeled ventrally, widely flattened to slightly vaulted dorsally, in middle of valves (= margins of fruit) with a winglike densely and shortly dentate crest 1-2 mm wide, fruit in cross section widely triangular, 2-locular; valves thin, glabrous.
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