Herbs, perennial, 50-80 cm tall. Stems numerous, erect. Stipules long ovate, 1-1.5 cm, connate less than to middle. Leaves 10-15 cm, 15-19-foliolate; leaflet blades ovate to long ovate, 2-2.5 × 1.2-1.4 cm, both surfaces sparsely to densely pubescent. Racemes somewhat dense, with many flowers; bracts ± as long as pedicel; peduncle slightly longer than leaves. Pedicel 2-3 mm. Calyx campanulate, 5-6 mm, pubescent; teeth triangular, unequal, slightly longer than tube, adaxial teeth connate and slightly shorter than others. Corolla dark purple; standard obovate-oblong, 1.4-1.6 cm; wings slightly longer than standard; keel as long as to slightly longer than standard. Ovary pubescent. Legume divided into 2 or 3 articles; articles ellipsoid, 5-7 × 4-5 mm, compressed, appressed pubescent, margin irregularly dentate or entire. Fl. Jul-Aug, fr. Aug-Sep.
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