Herbs, perennial. Roots and rhizomes strong. Stem 50-90 cm tall, sparsely brown glandular punctate, prickly, white hairy. Leaves 15-22 cm, 11-15-foliolate; petiole sparsely glandular, prickly, white hairy; leaflets ovate or elliptic, 2.3-4.5 × 0.6-1.4 cm, adaxially sparsely puberulent, densely brown glandular, base rounded or slightly cordate, margin undulate, apex obtuse. Racemes 11-19 cm, ca. as long as or longer than leaves, sparsely glandular, prickly, hairy; bracts lanceolate, white hairy. Calyx campanulate, 9-10 mm, densely brown glandular punctate and pilose; upper 2 teeth nearly joined completely. Corolla 1.2-1.6 cm; standard narrowly elliptic, 13-15 × 3-5.5 mm, base shortly clawed; wings oblong, ca. 6.5 × 1.9-2.5 mm, claw linear, auriculate. Ovary straight, densely puberulent. Legume zigzag, oblong, flat, 12-30 × 5-7 mm, pilose. Seeds 1-9. Fl. Jun-Aug, fr. Jul-Oct. 2n = 16*.
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