Perennial; rhizomes widely spreading; old basal sheaths yellowish brown, finally fibrous. Culms robust, erect, 1–2 m tall, 0.8–1 cm in diam. Leaf sheaths smooth, glabrous, papery, longer than internodes, loosely overlapping and clothing much of culm; leaf blades flat, stiff, up to 50 cm, 5–10 mm wide, abaxial surface smooth, glabrous, adaxial surface closely ribbed, apex usually convolute; ligule 5–8 mm. Panicle dense, spikelike, narrowly lanceolate in outline, up to 50 × 3–4.5 cm; branches erect, slender, scabrid. Spikelets 1–1.6 cm, pale yellowish; glumes puberulous, apex obtuse-erose; lemma 1–1.2 cm, densely villous with spreading ca. 4 mm hairs, apical teeth membranous, 0.4–0.6 mm, obtuse; awn 0.7–1 cm, bent just above base, slightly flexuous. Anthers ca. 7 mm. Fl. and fr. May–Sep.
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A grass that keeps growing from year to year. The rhizomes are spreading. The stems are erect and 1-2 m tall. The leaf sheaths are smooth. The leaf blade is flat and stiff and 50 cm long by 5-10 mm wide.
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