Large woody vines. Young stems usually with abundant fine brown adpressed or spreading hairs, later usually glabrous. Leaves 25-33 cm; petiole 8-13(-15) cm, usually hairy like stem; stipels usually not persistent even on young leaves but occasionally present, robust, 2-5 mm; leaflets papery or leathery, glabrous or with abundant light brown or reddish adpressed or spreading hairs especially on veins, lateral veins (3 or)4-6(or 7) pairs, gently curved; terminal leaflet ovate, elliptic, or slightly obovate, (7-)10-19 × (3-)5-10 cm, base rounded or slightly cuneate, apex broadly acute or shortly acuminate; lateral leaflets 10.5-17 cm, width ratio of abaxial to adaxial halves 2:1, base of abaxial half truncate. Inflorescence usually arising from old stems, 5-23 cm, with 5-17 nodes usually spaced throughout most of length; pedicels 8-10 mm, with dense minute brown spreading hairs and sparse fine bristles; bracts and bracteoles ovate, bracteoles 2-5 mm, shorter than calyx, caducous. Calyx with dense minute spreading hairs and pale caducous bristles; tube 8-12 × 12-20 mm; lateral lobes 3-4 mm, lowest 5-6 mm. Corolla bicolored, standard greenish or pinkish white, wings deep purple, keel lighter purple or sometimes yellowish green; flowers occasionally large with standard, wings, and keel up to respectively 4.5 cm, 6 cm, and 7 cm, but usually shorter: standard 3-3.5 cm, apex with margin conspicuously brown pubescent in apical 1/4-1/3; wings 4-5.2(-5.6) × 1.5-1.7 cm, margin around apex pubescent like standard; keel 5-6.3 cm. Legume linear, straight or slightly curved, 26-48 × 3-5 cm, 7-10 mm thick, woody, with margins often markedly constricted between seeds, base without narrow neck, with dense minute spreading hairs or partly glabrous with age, with irregular ribs and wrinkles, interior septum woody, 1-5 mm thick, margins not distinctly thickened and without median groove along suture but often with irregular woody ribs closely parallel to margin, apex acute. Seeds 6-15, dull black, disk-shaped, slightly asymmetric, laterally flattened, 2.2-3 × 1.8-2.8 cm, 5-10 mm thick; hilum deep brown or black, length ca. 3/4 of seed circumference or more. Fl. Nov-May, fr. Apr-Nov.
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A large woody vine. The young stems have fine hairs. The leaves are 25-33 cm long. They have leaflets that are oval and 10-19 cm long by 5-10 cm wide. The flowering stalks arise from old stems and are 5-23 cm long. The flowers are greenish white with purple wings. The pods are 26-48 cm long by 3-5 cm wide and 7-10 mm thick. There are 6-15 seeds that are disk shaped and 2-3 cm long by 2-3 cm wide and 5-10 mm thick.
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