Culms tufted, (40–)60–110(–120) cm tall, usually robust, erect, scabrid, nodes 3; upper internode elongated, to ca. 80 cm, ca. 2.5 mm thick. Leaf sheath scabrid, slightly longer than leaf blade; leaf blade flat, scabrid, 2–4 mm wide, ligule membranous, (0.2–)0.5–3.5 mm. Panicle narrow, 10–23 × (1–)2–4(–6) cm; branches straight, lower part naked, upper part with 4–6 spikelets. Spikelets 3.5–8 mm, florets 2–5(–6); rachilla pubescent, prickled, warty or glabrous; glumes subequal, lanceolate, apex slightly acuminate, 2.5–3.5(–5) mm; lemma broadly lanceolate, 3–4 mm; keel scabrid, lower half and lower 1/3 of marginal veins villous; callus sparsely villous; palea keels, scabrid or shortly pubescent, area between glabrous. Anthers 1.4–2 mm. Fl. Aug. 2n = 28, 35, 42.
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