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Corolla mauve-blue or violet; standard sometimes with white spots at the base, 10–15 × 7–12 mm overall, rounded oblong, emarginate at the apex, densely silvery brown silky outside; without appendages but with slight folds at the base; auricles 2 mm long; claw 3–4 mm long, broadly obtriangular; wing blades 9 × 3–4 mm, oblong, with claw 3 mm long; blades of keel petals 9–11.5 × 4.5–6 mm, oblong-elliptic, with claws 2.5 mm long.
Inflorescences branched or unbranched, (2)10–30 cm long, appressed brown pubescent; peduncle (0)4 cm long; cymule-stalks nodular, c.1 mm long, 3–5-flowered; bracts 5 mm long, lanceolate, very deciduous; bracteoles 1.2–1.5 mm long, oblong; pedicels 2–4 mm long.
Seeds dark brown, transversely placed, 14 × 10 × 3.5 mm, flattened ellipsoid or oblong; hilum with an incomplete rim aril produced into a ligulate process appressed to the non-dilated funicle.
Ovary 6–8 mm long, densely silky pubescent with white and brown hairs, 4–6-ovuled; style glabrous, 4–6 mm long, curved through 90°; stigma small, erect.
Liane 4.5 to 40 m tall, reaching the forest canopy layer, becoming massive with lower main stems like vast cables, much-fluted, 7.5–10 cm in diameter.
Pods flat, 5–10.5 × 2–3 cm, ± oblong, rounded at the apex with a sharply deflexed beak, (1)2–5-seeded, densely yellow-brown or brown appressed silky.
Branchlets velvety with appressed green-brown to chocolate-coloured hairs; stems later glabrescent and white-lenticellate.
Stamen sheath 8.5 mm long with free parts (2)3–4 mm long; anthers 0.8 mm long; upper filament free at the base.
Calyx silvery-brown velvety; tube 2.5 mm long; lateral lobes 1.5–2 mm long, lower lobe 2.5–3 mm long.
