Perennial glabrous or sparsely hairy climbing shrub or liana, stems with deep furrows, trifoliolate mucronate leaves glabrous above, hairy beneath, axillary 400mm racemes of 60mm reddish to deep purple, rarely white flowers, calyx 15mm long with teeth to 10mm, standard 32mm, wings 55mm x 14mm, keel to 57mm x 9mm, winged pod to 180mm long x 55mm with red irritant bristles, wing to 10mm