Herbs, perennial, 45-60 cm tall. Stems erect, solid. Stipules connate. Leaves 15-20 cm, (11-)15-21(-27)-foliolate; leaflet blades elliptic, ovate, or oblong-elliptic, 1.5-3 × 0.6-1.5 cm, abaxially pubescent, adaxially glabrous or sparsely pubescent. Racemes with many flowers; bracts lanceolate, (1-)3-10 mm; peduncle longer than leaves. Pedicel 3-5 mm. Calyx campanulate, 7-9 mm, pilose; teeth subulate, most abaxial tooth slightly longer than others. Corolla purple; standard obovate, 1.7-2 cm; wings shorter than standard, with auricle less than 1/2 as long as claw; keel ± as long as standard. Ovary pubescent. Legume divided into 1-3 articles; articles ellipsoid, compressed, pubescent, margin irregularly dentate.