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Robust tussock-forming perennial with short rhizomes and sometimes with looping stolons; culms up to 210 cm tall, 3.5–8 mm in diameter at the base, stout, erect, branched below or unbranched; basal leaf sheaths chartaceous, glabrous to densely long-pilose near the margins, terete, persistent; leaf laminas up to 60 cm × 8 mm, flat or folded, glabrous, the midrib forming a broad white line above, harshly scabrid on the margins, tapering to a long filiform apex.
Robust, reed-like perennial 880-1600 mm high; rhizomatous. Leaf blade 300-600 x 6-10 mm. Inflorescence linear, more than 5 x longer than wide, branches not whorled. Spikelet 1.7-2.5 mm long; glumes ± equal, as long as spikelet, keeled, keel scabrid; lower glume 4/5 as long as spikelet, 1-nerved; upper glume equalling or little shorter than lower glume, narrowly ovate, apex acute; lemma as long as spikelet, similar to upper glume; anther 0.9-1.2 mm long.
Spikelets 1.8–2.6 mm long, pale green; inferior glume 4/5 as long to as long as the spikelet, lanceolate, 1-nerved, scabrid on the nerve, acute at the apex; superior glume equalling or a little shorter than the inferior, narrowly ovate, 1-nerved, scabrid on the nerve, acute at the apex; lemma similar to the superior glume; anthers 3, 0.9–1.4 mm long.
Robust and reed-like perennial, rhizomatous, up to 1.6 m high. Leaf blades 300-600 mm long, 6-10 mm wide. Spikelets 1.7-2.5 mm long. Panicle not whorled, linear, more than 5 times longer than wide; lower and upper glumes ± as long as spikelet; glumes keeled, keels scabrid.
Panicle 25–35 cm long, linear-lanceolate; primary branches not in whorls, 3–10 cm long, appressed or diverging, spiciform, smooth or scaberulous, eglandular, the spikelets densely packed along their whole length.
Grain 0.7–1 mm long, narrowly elliptic, square or oblong in section.
