Herbs, perennial, 10-15[-40] cm tall. Stems ascending to erect. Stipules lanceolate, 1-1.5 cm, connate farther than middle. Leaves 7-12 cm, 11-17-foliolate; leaflet blades ovate to oblong, 1.2-1.7 × 0.6-0.9 cm, abaxially sparsely pubescent, adaxially glabrous. Racemes dense, with many flowers; bracts lanceolate, slightly longer than pedicel; peduncle slightly longer than leaves. Pedicel 2-3 mm. Calyx campanulate, 4-5 mm, pubescent; teeth triangular, ± equal, ca. 1/2 as long as tube. Corolla purple; standard long obovate, 1.4-1.6(-1.8) cm; wings slightly shorter than standard, straight or slightly curved downward at apex; keel shorter than standard and wings. Ovary glabrous. Legume divided into 3 or 4 loments, inconspicuously constricted between articles at abaxial suture; articles ellipsoid, 5-6 × 4-5 mm, compressed, glabrous, margin entire. Fl. Jun-Jul, fr. Jul-Aug. 2n = 8.
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