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Rhizomatous perennial; culms 20–150 cm. high, usually spongy at the base with cross-veins in the papery sheaths.. Leaf-blades flat or folded, 5–35 cm. long, 2–10 mm. wide, ridged above, glabrous, papillose or pubescent.. Panicle cylindrical, 3–30 cm. long, dense.. Spikelets narrowly ovate, laterally compressed, 1.7–2.5 mm. long, mostly glabrous; lower glume ovate, ± 1/2 as long as the spikelet; upper glume membranous; lower floret ♂, its palea almost as long as the lemma.
Robust, erect perennial, hydrophyte and rhizomatous (rhizome creeping and branched, culms usually spongy at base), 500-1500 mm tall. Leaf blades 100-350 mm long, 2-10 mm wide, leaf sheaths papery with prominent cross-veins. Spikelets 1.7-2.5 mm long. Panicle spikelike, 100-300 mm long, 4-7 mm wide, dense; spikelets laterally compressed; lower glume ± half the length of upper glume.
Culms 20–150 cm. high, usually spongy at the base with cross-nerves in the papery sheaths.
Leaf laminae 2–10 mm. wide, flat or folded, strongly ribbed, papillose or not.
Spikelets 1.7–2.5 mm. long, ovate, mostly glabrous.
Panicle 3–30 cm. long, cylindrical, dense.
Shortly rhizomatous perennial.
