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Corolla c. 6 mm long, yellow-purple or violet at the apex; standard c. 6 × 4 mm, elliptic, emarginate at the apex, tapering at the base into a short claw; wings 6 mm long including the 1.5 mm long claws, the blades 3 mm wide, falcate-oblong, auriculate at the base; keel petals c. 5 mm long including the 1.5 mm long claw, the blades c. 1.5 mm wide, rounded at the apex, auriculate at the base.
Undershrub, up to 1 m tall, from a woody taproot. Leaves pinnately (3)7-17-foliolate, leaflets oblong-elliptic to ovate, softly hairy on both surfaces. Flowers many, covering three quarters of inflorescence with axis 2-3 times as long as leaves, yellow-purple or violet. Pod flattened, ovate-elliptical, lightly hairy or glabrous, pale green, usually with small red or purple spots.
Pod 15–22 × 8–10 mm, flattened, elliptic-oblong, rounded at the apex but with persistent curved style, tapering to the base into a 1–2 mm long stipe, thinly pubescent or glabrous, pale green, usually with small red or purple spots.
Racemes up to 25 cm long, laxly many-flowered, silky hairy; peduncle 3–4 cm long; bracts c. 1.5 mm long, ovate; pedicels 1.5 mm long.
Stems virgate, much branched from the base, herbaceous and pithy above, striate, green-greyish, covered by dense soft hairs.
Filament sheath up to 3.5 mm long; free parts of the filaments 1–2 mm long; free stamen 4 mm long; anthers c. 1 mm long.
Calyx 3–4 mm long, campanulate, 5-toothed in the upper third, thinly silky hairy becoming puberulous.
Ovary c. 3.5 mm long, oblong, few-ovulate, villous-pubescent or glabrous; style c. 2 mm long.
Erect perennial herb up to 1 m high, from a woody taproot.
Seeds 1–3 in each pod, 3 × 2 mm, reniform, blackish.
