Stems to 2 (-4) m tall. Leaves 55-111 cm long, strongly keeled (opposing pinnae inserted at 45-60° on rachis), with 120-260 pinnae, dark green or grey-green (blue when new), semi-glossy or highly glossy. Petiole 12-24 cm long, spinescent for 60-100% of length. Median pinnae 9-17 cm long, 4-6 mm wide, narrowed to 3-4 mm at base (to 65-85% of maximum width), inserted at 45-60° to rachis, 5-10 mm apart, glabrous; margins recurved; midrib flat above, raised below. Cataphylls linear, pungent, 4-7 cm long. Pollen cones ovoid, 15-20 cm long, 8-11 cm diam., orange. Microsporophyll lamina 30-35 mm long, 9-13 mm wide; apical spine 6-9 mm long. Megasporophylls 16-32 cm long, with 4-6 ovules; lamina ovate to lanceolate, 50-80 mm long, 16-37 mm wide, regularly dentate with 30-36 lateral spines 0.5-2 mm long and 1 mm wide; apical spine 20-25 mm long. Seeds 30-40 mm long, 27-38 mm wide.
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