Stems to 3 (-7) m tall. Leaves 100-130 cm long, strongly keeled (opposing pinnae inserted at 30-90 (-150)° on rachis), with 180-270 pinnae, blue, dull. Petiole 17-21 cm long, spinescent for 30-100% of length. Median pinnae 17-21 cm long, 4.5-6 mm wide, narrowed to 3-4.5 mm at base (to 60-80% of maximum width), inserted at 40-80° to rachis, 5-9 mm apart, tomentose; margins recurved; midrib flat above, raised below. Cataphylls narrowly triangular, soft, 4-6 cm long. Pollen cones ovoid, 15-20 cm long, 7-9 cm diam., orange. Microsporophyll lamina 30-35 mm long, 12 mm wide; apical spine 8 mm long. Megasporophylls 16-26 cm long, with 4-6 ovules; lamina lanceolate, 40-60 mm long, 20-30 mm wide, obscurely dentate or regularly dentate with 22-36 lateral spines 1-3 mm long and 1 mm wide; apical spine 15-25 mm long. Seeds 35-46 mm long, 28-38 mm wide.
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