Climbing woody vines. Young stems glabrous. Leaves up to 22 cm; petiole 3-20 cm, with sparse short spreading soft pale hairs; stipels slender, 2-3 mm; leaflets membranous to papery with short fine spreading hairs on both sides, lateral veins 4-6, lower ones rather straight; terminal leaflet rhombic-elliptic or rhombic-ovate, 8-13 × 6-8 cm, base cuneate but at extreme base obtuse-rounded, apex obtuse with abrupt acumen to 1 cm; lateral leaflets up to 12 cm, width ratio of abaxial to adaxial halves 2:1. Inflorescence 10-12 cm, pendulous with 5 or more nodes throughout most of length; pedicels 6-10 cm, with adpressed light brown short hairs; bracts broadly ovate, boat-shaped, 12-14 × 7-9 mm, bracteoles narrowly ovate, all caducous before flowering. Calyx tube ca. 8 × 13 mm, upper lip well marked, equaling lateral and lower lobes, all 10-12 mm. Corolla deep purple; standard 3-3.5 cm, ca. 2/3 keel length; wings ca. 5 × 2 cm; keel ca. 5 cm. Legume asymmetric, elliptic-ovate to oblong in outline, (4-)6-9 × 4-5 cm, 5-10 mm thick, leathery, surface with abundant very short spreading pale hairs and brown irritant bristles, apex rounded or acute, both margins with pair of sinuate wings 6-10 mm wide, both surfaces of legume with 9-12 obliquely transverse slightly undulating but well-spaced shallow lamellae of irregular height up to 5(-10) mm high and mostly interrupted along midline, some extending onto marginal wings of fruit. Seeds 1 or 2, brownish black, flattened-discoid, ca. 2 cm in diam.; hilum ca. 3/4 of seed circumference.
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