Lianas, 3-10 m. Stems dark brown, terete, straight, fine ridged, brown tomentose, glabrescent, without lenticels. Leaves 3(or 5)-foliolate; rachis 12-28 cm, including petiole 5-8 cm; stipels absent; leaflet blades broadly elliptic to elliptic, (6-)10-18 × 5-8 cm, subleathery, both surfaces glabrous and shiny, reticulate veins prominent, base obtuse to broadly cuneate, apex rounded and with a cusp. Panicles terminal, 15-30 cm; flowering branchlets spreading, often leafy at base, brown tomentose, nodes congested. Flowers 1.5-2.5 cm. Corolla pale yellow flushed with red or lilac; standard oblong, without basal calluses, outside densely sericeous. Ovary stipitate, sericeous, with 4-7 ovules. Legume ellipsoid when 1-seeded and ca. 5.5 × 4 cm, linear-oblong when 2-or 3-seeded and ca. 7 × 3 cm, inflated but contracted between seeds, brown tomentose but generally glabrescent, base tapering to 5 mm stipe, apex with a hard hooked beak. Seeds 1-3 per legume, dark brown, subglobose to oblately spheroid, 2-2.5 × 1-2.5 cm. Fl. Jul-Sep, fr. Oct-Dec.
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A creeper. It can be 3-10 m long. The stems are dark brown. The leaves have 3 or 5 leaflets. The leaflets are oval and 10-18 cm long by 5-8 cm wide. The flowers are in groups 15-30 cm long at the ends of branches. The flowers are 2-3 cm across. The pods are oval and have one or up to 3 seeds. They are 6-7 cm long by 3-4 cm wide.
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