Plants perennial, usually laxly tufted. Culms erect, 40–70 cm tall, 3-or 4(–6)-noded, smooth, glabrous. Ligule membranous; auricles usually absent; leaf blade flat, 3.5–15 × 0.3–0.4 cm, both surfaces glabrous but scabrous, epidermis without silica cells. Spike green or purplish green to blackish purple, 5–8 × 0.3–0.6 cm; rachis slightly brittle near base, very brittle distally, margin scabrous to ciliate. Lateral spikelets rudimentary, rarely male; glumes setaceous, 0.5–0.9(–1) cm, scabrous; lemma and palea ca. 4.2 mm; lemma awn ca. 2.3 mm. Central spikelet usually with 1 floret; glumes setaceous, 6–8 mm; lemma lanceolate, 5–7 mm, glabrous, awn (2–)4–8 mm; palea slightly shorter than or equaling lemma. Anthers yellow, 1–1.7 mm. Fl. and fr. Jun–Aug. 2n = 14*, 28.
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