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Leaflets 2–9 × 0.9–3.5(4.5) cm, elliptic, oblong-elliptic or oblong-lanceolate, acute and mucronate or rounded at the apex, cuneate, rounded or slightly cordate at the base, slightly to fairly densely pubescent beneath, sometimes glaucous; petiole winged, 0.8–6 × 0.4–3.5 cm, oblong, obovate, oblanceolate, obcordate or almost round, rounded or narrowly to widely emarginate at the apex, obtuse to slightly cordate at the base; stipules 4–10 × 0.6–1.5 mm, linear to lanceolate.
Standard all white or yellow or yellow outside and mauve inside, the veins and outer flush dark purple or crimson, (10)15–23 × (10)12–20 mm, obovate, glabrous to finely or densely puberulous outside; wings and keel bluish-purple or keel yellow-green tipped purple; rarely flowers all white.
Inflorescences usually elongate and narrow, falsely racemose, the flowers arranged in fascicles along the rhachis, 15–50 cm long, or flowers all in axillary fascicles; peduncle 0–11 cm long; pedicels 2–22 mm long; bracts 1.5–4 × 0.7–1.5 mm, ovate to lanceolate, soon falling.
Fruit densely yellowish-brown hairy, stipitate, the stipe rapidly enlarging and attaining 3–7 cm; articles 1–5, strongly compressed, 5.5–9(13) × 5–6(7) mm, broadly elliptic or almost round.
Perennial herb, shrub, or small subshrub (0.1)0.6–2.5(3) m tall, with several shoots from a woody rootstock, very rarely a small tree to 3(?4.5) m.
Seeds dark crimson-brown, 4 × 3 × 1 mm, compressed-reniform; hilum minute, almost round, the seed somewhat beaked on one side of it.
Calyx pubescent or hairy; tube 2.5–6 mm long; lobes 3–8.5 mm long, the upper pair joined for most of their length.
Stems glaucous and glabrous to appressed pubescent or velvety.
