Stems to 1.5 (-2.5) m tall. Leaves 90-160 cm long, flat (not keeled) in section (opposing pinnae inserted at 160-180° on rachis), with 180-270 pinnae, mid-green, semi-glossy. Petiole 25-35 cm long, spinescent for 50-100% of length. Median pinnae 9-19 cm long, 4.5-6.5 mm wide, narrowed to 3-5 mm at base (to 70-80% of maximum width), inserted at 60-90° to rachis, 9-14 mm apart, tomentose (brown below); margins recurved; midrib flat above, raised below. Cataphylls narrowly triangular, soft, 4-7 cm long. Pollen cones narrowly ovoid to fusiform, 25 cm long, 9 cm diam., orange. Microsporophyll lamina 25-30 mm long, 6-9 mm wide; apical spine 5 mm long. Megasporophylls 15-20 cm long, with 4-6 ovules; lamina lanceolate, 30-40 mm long, 14-18 mm wide, obscurely or regularly dentate with 18-26 lateral spines 0-1 mm long and 1 mm wide; apical spine 8 mm long. Seeds 28-32 mm long, 25-29 mm wide.
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