Herbs, perennial, 30-60(-90) cm tall. Stems several, erect. Stipules lanceolate, 1.5-9 mm, connate farther than middle. Leaves 8-12 cm, 11-15-foliolate; leaflet blades long ovate to ovate-oblong, 2-3 × 0.8-1.4 cm, abaxially sparsely pubescent, adaxially glabrous. Racemes dense, with many flowers; bracts ca. 2 × as long as pedicel, subequal to calyx teeth; peduncle longer than leaves. Pedicel ca. 2 mm. Calyx campanulate, 5-6 mm, pubescent; teeth triangular-lanceolate, ± as long as tube. Corolla purple; standard obovate, 1.3-1.4 × 0.6-0.8 cm; wings as long as to slightly shorter than standard; keel ca. 2 mm longer than standard. Ovary pubescent. Legume divided into 3 or 4 articles; articles globose to ovoid, 5-6 × 4-5 mm, compressed, appressed pubescent, margin ca. 1 mm and entire. Fl. Jul-Aug, fr. Aug-Sep.
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