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Corolla showy, purple or blue with yellow patches at base of standard; standard 1.4–1.9 × 1.2–1.6 cm, almost round, white silky outside, tapering into the 3–5 mm long claw, folds and appendages lacking; wing blades 12–13 × 4–6 mm, oblong, glabrous except at apex, with claw 6 mm long; blades of keel petals similar, 12–13 × 6 mm, glabrous, with claw 5–6 mm long.
Inflorescence (8.5)12–25 cm long including peduncle 1.5–13 cm long, sparsely rusty pubescent; cymule rachis stout, 4–7 mm long, 2–4(5)-flowered; pedicels (2)6–10 mm long, with red pubescence; bracts 2 mm long, triangular subulate; bracteoles 0.7–1 mm long.
Ovary 1 cm long, linear, with short spreading yellowish hairs, (6)8–9-ovuled; style 1.1 cm long, pubescent at the base, curved through 90° at the middle.
Stamen sheath 1.5–1.7 cm long; free parts of filaments (2)3–4 mm long; upper filament free or adhering near the middle; anthers 0.6–0.7 mm long.
Young branches dark grey, sparsely rusty pubescent; older branches grey with elliptic lenticels, noduled and ridged.
Calyx sparsely rusty-pubescent; tube c.4 mm long; teeth 1–1.5 mm long, broadly triangular, obtuse.
Pods brown, 10–16 × 1.4–2.4 cm, linear-oblong, deflexed at the apex, 2–6-seeded, glabrescent.
Shrub or small tree, 1.8–17(25) m tall, sometimes many-stemmed.
Seeds blackish, 9 × 7 mm, compressed oblong-ellipsoid.
Disk absent.
