Stems clustered, climbing, to 6 m, to 3 cm in diam. Leaf sheaths with brown hairs, densely covered with gray or black, flattened spines to 2 cm; ocreas to 10 cm, spiny as sheath, fibrous, disintegrating; knees absent; flagella present; petioles 20-58 cm; rachis to 50 cm with 15 or 16 linear to lanceolate pinnae per side, these irregularly arranged in distant clusters of 2 or 3 pinnae, apical few pinnae in a fan shape, apical pair free; middle pinnae 17-27 cm, 1.5-2 cm wide at mid-point, margins minutely bristly, densely white waxy abaxially and with many minute spines; cirri absent. Inflorescences 1-2 m, flagellate; inflorescence bracts tubular. Fruits brownish, pear-shaped to ovoid, to 2.5 × 1.5 cm, scales with densely brown tomentose margins.
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