Perennial from a knotty rootstock. Culms loosely tufted, erect or decumbent, 45–130 cm tall, up to 6 mm in diam. Leaf sheaths ± papillose-pilose, margins usually ciliate; leaf blades narrowly lanceolate, plicate, thin, 10–40 × 1–3 cm, papillose-pilose, hispidulous or glabrous, narrowed toward base, apex attenuate; ligule ca. 3 mm, ciliate. Panicle 15–33 cm, branches up to 8 cm, loose, ascending, some spikelets subtended by a single 10–20 mm bristle. Spikelets ovate-oblong, 3–4 mm, acute; glumes with broad papery margins; lower glume ovate-orbicular, 1/4–1/3 as long as spikelet, obtuse to truncate; upper glume 1/2–3/4 as long as spikelet, 5–7-veined, obtuse or acute; lower lemma staminate or neuter, usually equaling upper floret, 5-veined; lower palea often well developed; upper lemma usually distinctly rugose, rarely smooth, apiculate. Fl. and fr. Jun–Oct. 2n = 36.
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A grass. It keeps growing from year to year from a knotty rootstock. It can form tufts. It grows 45-130 cm tall. The stems are up to 6 mm across. The leaf blades are 10-40 cm long by 1-3 cm wide. They are pleated.
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