Diffuse suffrutex. Stems slender, 4-angled, striate-ribbed, up to 0.7 m long. Leaflets distinctly 3-lobed, with prominent net-venation, 40-90 x 35-60 mm, mucrons conspicuous, scabrous on both sides; petiole 10-55 mm long; stipules ovate, striated, 5-9 x 3-4 mm. Flowers in pseudo-racemes, peduncles much longer than petioles, nodulose, 75-140(-260) mm long, 15-many-flowered; flowers (5-)8-15(-20) mm long; bracts and bracteoles caducous. Calyx brown, pubescent, with equal lips, upper lip 4-5 mm long; lower lip 4-5 mm long. Corolla green or greenish-yellow; standard oblong, 10-6 x 7-9 mm, glabrous, claw 1-3 mm long; wings almost straight, blunt, 7-12 x 2-3 mm, claw 1-3 mm long; keel longer than wing, 10-16 x 4-6 mm, claw 1-3 mm long. Ovary narrowly oblong, 4-5-ovuled, 6-8 mm long. Fruit oblong, sometimes very broad, 56-60 x 10-15 mm, scaberulous, warty along the margins, 3-4-seeded. Seeds dark brown or black.
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Perennial herb, up to 1.5 m high; robust, twining. Leaves trifoliolate; leaflets slightly lobed, lateral leaflets asymmetric, terminal leaflet 45-55 x 40-45 mm, base cuneate. Flowers: corolla bright pink or mauve; Nov. Pods at least 10 mm broad, somewhat falcate.
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