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Corolla greenish-white; standard c. 4 × 3 cm with claw 4 × 5 mm, broadly elliptic; wings 5–5.7 × 1.2–1.5 cm, ± oblanceolate, rounded, claw 9 mm long with appendage 5 × 3 mm; keel 4.8–5.2 × 0.75 cm, curved at right angles near the apex, 1.6–2 cm long, the bent part strongly incrassate; claw 7–9 mm long.
Calyx appressed pubescent and with some golden-brown bristles; tube 8 mm long, 1.5–2 cm wide; lateral lobes 3 × 2.5 mm, narrowly triangular, upper 2 lobes united into an emarginate lip 3 × 8 mm; inferior lobe 5 × 3 mm, very narrow.
Pod 10–13 × 2.1–2.4 cm, ± S-shaped when young, curved-oblanceolate when mature, 3–4(5)-seeded, longitudinally bicostate, very densely covered with golden-brown irritant bristles.
Inflorescences c. 25 cm long, 50–100-flowered, densely appressed silvery hirsute, the fascicles sessile and several-flowered; peduncle 15–18 cm long.
Seeds dark brown, compressed, 13.5–15.5 × 12–13.5 × 3.5–4.5 mm, ellipsoid, with hilum 4 mm long surrounded by a black aril.
Liane with striate blackish stems densely covered with spreading pale hairs.
