The stems are erect, growing to 3-5 m tall and 7-14 cm diameter. The leaves are blue-green fading to green, 60-105 cm long, pinnate, with 100-170 leaflets. The leaflets are 10-20.5 cm long and 4.5-8 mm wide, and lie flat or in a shallow 'v'-shape on either side of the leaf stem. The petiole are 15-25 cm long, and armed with sharp spines for most of their length.
The female cones are open, with sporophylls 16-25 cm long, with two to four ovules per sporophyll. The lamina is lanceolate, with spined dentate margins and an apical spine. The male cones are solitary, ovoid, 15-22 cm long and 8-12 cm diameter, orange, the sporophylls 35-45 mm long with an upturned apical spine.