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Leaves up to 16 cm long; petiole 1–3 cm long, rachis 6–12(14) cm long, fulvous-puberulous, glabrescent; petiolules 1–2.5 mm long; leaflets (5)6–9(10) on each side of the rachis, (1)1.5–4.5 × 0.7–1.5(2) cm, elliptic to oblong-elliptic or obovate-oblong, rounded to broadly obtuse or truncate at the apex, margin recurved, base often slightly asymmetric, rounded or subcordate, thin and stiff, dull green, glabrous on upper surface, paler, puberulous-glabrescent beneath, midrib impressed above, prominent beneath, lateral nerves in 5–8 pairs, scarcely conspicuous; stipules c.6 mm long, caducous.
Standard 6–7 mm long, obovate, with somewhat wavy margin, emarginate, claw c.1.5 mm long; wings obliquely obovate, auricle obtuse, claw c.2 mm long; keel petals shorter than the wings, dorsally slightly connate or free, claw 2.5 mm long.
Inflorescence of axillary and terminal panicles, often also borne precociously in axils of fallen leaves, 2–5 cm long, rufous-or fulvous-tomentellous; bracts and bracteoles small, usually present at anthesis.
Pod flat, 1–2(3)-seeded, 6–12 × 2–3.5 cm, coriaceous, at first densely pubescent, glabrescent, apex rounded or obtuse, base cuneate to narrowed, rather thickened and eventually cracking over the seeds.
Climbing or scandent shrub or liane up to 12 m tall, often with side branches on older wood becoming hooked or coiled and tendril-like (stem-tendrils), deciduous.
Calyx 3.5–4 mm long, puberulous; upper teeth shallow-lobed, the lateral ones rounded, the lower one c.1.5 mm long, triangular-acute.
Ovary 2–3-ovulate, pilose on midrib and suture; style 1.5 mm long; stipe c.3 mm long, puberulous.
Young parts fulvous-or rufous-tomentellous or pubescent-glabrescent.
Stamens in a single bundle, occasionally the upper one free.
Flowers white, 6–8 mm long; pedicels 1.5–5.5 mm long.
Seed 10–15 × 6–7 × 4 mm; testa brown.
