Climber to 15m. Leaf sheaths with stout spines. Leaves to 660mm long with 25-26 pairs of leaflets, leaflets to 240mm x 20mm. Staminate inflorescence to 1.4m with rachillae to 41mm long. Pistillate inflorescence to 2m with rachillae to 55mm long terminating in a spine-like bracteole. Fruit 13mm x 6.8mm.