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DescriptionPerennial twining herb, sometimes forming mats. Leaves 3-foliolate. Leaflets up to 6.5 cm long, elliptic or oblong-lanceolate, more or less velvety on both surfaces; petiole 1-5.5 cm long. Inflorescences several-flowered, axillary; peduncle 2.5-5.5 cm long. Standard up to 4 × 3.5 cm, mauve-purple with a white or yellowish central band, often flanked by darker purple lines, pubescent outside, with a short spur outside just above the claw. Pod linear, 5-17 cm long with 2 raised ribs along the edges of the valves, velvety when young, becoming hairless.