Woody mostly glabrous vine to 10m with lenticellate stems. Trifoliolate leaves, leaflets to 150mm x 100mm, glabrous above, few scattered hairs on nerves beneath. Many-flowered racemes to 400mm long subtended by bracts 5mm long. Pale purple flowers 30mm long, pubescent calyx 15mm long with 3 teeth to 8mm x 4mm & 2 upper teeth 5mm x 7mm, clawed petals, standard petals 25mm wide with claw 7mm long.