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Leaves pinnate with 4–6 pairs of leaflets, or the upper leaves with 1–3 pairs; petiole 0.8–5 cm long, the petiole and rachis together 5–12.5 cm long, their pubescence resembling that of the stem; leaflets (1.5)2–5(7) × 0.4–1.5(2) cm, narrowly elliptic to obovate or oblanceolate, subacute to slightly emarginate at the apex, cuneate to rounded at the base; upper surface glabrous, lower surface rather thinly appressed-pubescent or sometimes also with scattered ascending hairs; stipules 4–9 × 0.5–1 mm, linear.
Petals 8–12 mm long, purplish or the keel white, the standard brown pubescent outside, all, or at least the keel, with usually golden pellucid gland dots; standard ± reniform or laterally oblong, broader than long, rather strongly upwardly curved.
Calyx 3.5–5(6) mm long, shortly ascending-pubescent to grey villous; the lateral teeth about or almost equalling the campanulate part, the two upper teeth very short and distinguishable only as a pair of ± subulate projections up to 0.5 mm long.
Flowers in terminal and axillary elongate racemes 8–16(24) cm long, or in dense heads (see subspecies); bracts 2–5 × 0.4–0.7 mm, ± linear, falling early; pedicels (3)4–7 mm long, grey pubescent to villous.
Pods 40–55 × 4–5 mm, when immature with pale brown tomentum on the surfaces and darker on the sutures, at maturity with spreading darkish hairs over surfaces.
Annual or ?short-lived perennial with erect branched stems 1–2.3 m high.
Seeds (6)7–8, c.4.5 × 2 × 1.5 mm, oblong and rounded at the ends.
Stems appressed to spreading-pubescent, hairs brown or grey.
Ovary pubescent; style pubescent.
Stamen tube fused above.
