Herbs, perennial. Stem 60-100(-120) cm tall, densely scaly glandular punctate, sparsely pubescent. Leaves 8-10 cm, 7-15-foliolate; stipules lanceolate, 5-7 × 2-3 mm, glandular punctate, glabrous; petiole densely scaly glandular punctate, densely villous; leaflets lanceolate or ovate-lanceolate, 2-5 × 0.7-1.5 cm, densely scaly glandular punctate, sparsely pubescent, base cuneate, apex acuminate. Racemes much flowered, globose or subglobose; rachis shorter than leaf, densely scaly glandular punctate, villous when young; bracts lanceolate, 6-7 mm, densely glandular punctate. Calyx campanulate, ca. 5 mm, sparsely scaly glandular punctate and pubescent, 5-toothed; upper 2 teeth partly joined. Corolla purple; standard narrowly ovate or elliptic, 6-9 mm, very shortly clawed; wings 5-6 mm; keel slightly shorter than wings, clawed, auriculate. Legume dense, narrowly ovoid, 12-18 × 4-6 mm, densely spiny, apex cuspidate. Seeds brown, ca. 4 mm. Fl. May-Jun, fr. Jul-Sep. 2n = 16*.
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