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Robust, erect perennial 1.0-1.8 m high; rhizome stout, oblique; culm node glabrous. Leaf blade 100-300 x 3-6 mm, often inrolled; rigid, tapering to a spiny point; loosely to densely hairy or glabrous. Inflorescence up to 200 mm long, spike-like; bristles 4-9, up to 12 mm long, antrorsely barbed, often grooved and sometimes with sparse long hairs in lower part, light or yellowish green. Spikelet 2.3-2.8 mm long; lower glume 1-nerved; lower lemma shallow to deeply grooved, palea absent; upper lemma rugose; anther 1-2 mm long.
Robust, erect perennial, rhizomatous (rhizome stout and oblique), up to 1.8 m high. Leaf blades 100-300 mm long, 3-6 mm wide (often inrolled). Spikelets 2.3-2.8 mm long. Panicle spike-like, up to 200 mm long; bristles often grooved and with sparse long hairs in lower part; lower glume 1-nerved.
