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Perennial herb, ultimately with a number of erect variably branched stems from a woody rootstock, but flowering from first year of growth, up to 0.5–1 m tall, glabrous overall; stems 3–4-angled, narrowly winged; wings 0.5–2 mm wide at leaf insertion, with stipules on outer points, decurrent into angle of the stem lower down.
Standard elliptic, yellow, lined and later flushed reddish-brown or purplish outside; wings shorter than the keel; keel 0.9–1.3 cm long, angular, sharply bent in the lower part with a long straight beak.
Racemes laxly few–many-flowered; bracts 1–2.5 mm long, linear-subulate to linear-lanceolate, 1–2.5 mm long; bracteoles inserted near the middle of the pedicel or below, smaller.
Calyx 6–8 mm long; lobes subulate or narrowly attenuate-triangular, longer than the tube, becoming reflexed.
Pod shortly stipitate, 2–2.8 × 0.6–1.2 cm, cylindrical, venose, glabrous, 14–18-seeded.
Seeds not seen.
