Herbs, perennial, 40-80 cm tall. Stems numerous, erect. Stipules long ovate, 8-10 mm, connate farther than middle. Leaves 8-12 cm, 11-or 13-foliolate; leaflet blades broadly ovate, 1.5-1.9 × ca. 0.8 cm, abaxially sparsely pilose, adaxially glabrous. Racemes dense, with many flowers; bracts lanceolate, ± as long as pedicel; peduncle as long as to slightly longer than leaves. Pedicel 1.5-2.5 mm. Calyx campanulate, 6-8 mm, pubescent; teeth lanceolate, ± as long as tube, most abaxial tooth slightly longer than others. Corolla purple; standard long obovate, 1.5-1.7 cm; wings ± as long as standard; keel 1-3 mm longer than standard. Ovary appressed pubescent. Legume divided into 3 or 4 articles; articles subglobose to ellipsoid, 5-6 × 4-5 mm, compressed, pubescent, margin inconspicuous. Fl. Jul-Aug, fr. Aug-Sep.
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