Herbs, perennial. Roots and rhizomes strong. Stem 50-150 cm tall, woody at base. Leaves 4-20 cm, 3-7(or 9)-foliolate; stipules caducous, brown, triangular-lanceolate, small, ca. 1 mm; petiole densely brown glandular punctate, densely pubescent when young; leaflets ovate, elliptic, or oblong, 2-6 × 0.8-3 cm, brown glandular punctate, sparsely pubescent on veins, base rounded, margin somewhat undulate, apex acute or obtuse. Racemes with rachis shorter than or ca. as long as leaves, densely glandular punctate, densely hairy when young; bracts oblong-lanceolate, ca. 3 mm, densely glandular punctate and pubescent. Calyx campanulate, 5-7 mm, densely glandular punctate and pubescent, 5-toothed; upper 2 teeth joined to 1/2 from base. Corolla purple or light purple; standard narrowly elliptic, 6-9(-12) × 4-7 mm, base shortly clawed, apex rounded; wings ca. as long as standard, obviously auriculate and clawed; keel shorter, auriculate and clawed. Legume straight or slightly curved, elliptic or oblong, 8-30 × 5-10 mm, inflated or somewhat constricted between seeds, brown glandular punctate and glandular hairy, sparsely villous. Seeds 1-4, green, orbicular, 2-3 mm in diam. Fl. May-Jul, fr. Jun-Oct. 2n = 16*.
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A herb. It has strong roots and rhizomes. The stems are 50-150 cm tall. They are woody at the base. The leaves are 4-20 cm long and have 3-7 leaflets. The leaflets are oval and 2-6 cm long by 1-3 cm wide.
Can be grown by divisions or seedlings. Seeds needs soaking.
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