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Perennial, densely tufted, shortly rhizomatous. Culms 20–80 cm tall, 1–2 mm in diam. Leaf sheaths scabrid with upwardly directed teeth; leaf blades usually rolled, 6–10 cm × 1–4 mm, abaxial (outer) surface smooth or scabrid; ligule 1–4 mm. Panicle spikelike, 2.5–8 cm, dense or rather lax, strongly to indistinctly 1-sided, sometimes lobed below, main axis usually visible. Spikelets 4–8 mm, green or purplish, fertile floret 1, terminal sterile lemmas gathered into globular cluster; glumes ovate, papery, 5-veined, lower glume 3/4–4/5 length of upper, upper glume as long as spikelet, both acute; lemma lanceolate, 2.5–3.2 mm, granular-scaberulous, 7–9-veined, densely ciliate along marginal veins with 2–3 mm hairs, apex acute; palea keels ciliolate. Anthers 0.8–1.5 mm. Fl. May–Jul. 2n = 18.
