Straggling and ascending or climbing woody herb or shrub, up to 1–6 m. tall.. Branches rather slender, subterete, puberulous and glabrescent.. Leaves 3-foliolate; leaflets elliptic-lanceolate, elliptic or elliptic-obovate, up to 25–46 mm. long, 11–18 mm. wide, glabrous above, appressed puberulous beneath; petiole slender, ± 22–36 mm. long.. Stipules linear, up to 1–2 mm. long, sometimes obscure.. Racemes usually lax with a slightly zigzag rhachis, up to 7–18 cm. long, ± 6–16-flowered; bracts linear to subulate, ± 1–3 mm. long; bracteoles inserted near the top of the pedicel, filiform, small.. Calyx 7–10 mm. long, protracted on the lower side, subglabrous to puberulous; upper lobes rather narrowly acuminate-triangular, mostly 1·5–2 times as long as the tube.. Standard broadly elliptic or suborbicular, clear yellow, sometimes lined with brown or purple and turning salmon or purplish with age, glabrous outside; wings ± as long as the keel; keel rather abruptly rounded below the middle, with a well-developed twisted beak, 13–17 mm. long.. Pod markedly inflated, broadly ellipsoid-clavate, shortly narrowed into a 7–10 mm. long stipe, up to 45–60 mm. long, 15–22 mm. across, thinly puberulous, glabrescent, developing a prominent vein network, ± 12–20-seeded.. Seeds oblique-cordiform, up to 5 mm. long, matt, pale yellow.
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