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Rhizomatous perennial; culms 30–300 cm. high, often wiry.. Leaf-blades 5–30 cm. long, 3–10(–20) mm. wide, occasionally with purple bars; ligule absent or a fringe of hairs; sheaths glabrous.. Inflorescence lanceolate (occasionally linear), 7–25 cm. long, the racemes 1–5 cm. long and densely crowded with appressed spikelets.. Spikelets elliptic to subglobose, small, 1.5–2.5(–3) mm. long, ± hispid; lower floret ♂, acute or with a short curved awn up to 5(–15) mm. long; upper lemma 1.5–2.3 mm. long.
Perennial; up to 3 m high; hydrophyte; rhizomatous and tufted. Leaf blades 50-100 x 3-10(-20) mm; ligule absent or a fringe of hairs. Flowers: inflorescence spike-like; 70-250 mm long; racemes 10-50 mm long; densely crowded with appressed spikelets; spikelets 1.5-2.5(-3.0) x 1.0-1.5 mm; subglobose to elliptic; lower floret male; lower lemma acute or with awns; 5-15 mm long.
Perennial, hydrophyte, rhizomatous and tufted, up to 3 m high. Leaf blades 50-100 mm long, 3-10(-20) mm wide; ligule absent or a fringe of hairs. Spikelets 1.5-2.5(-3) mm long, 1.0-1.5 mm wide. Inflorescence 70-250 mm long; racemes 10-50 mm long, densely crowded with appressed spikelets; lower floret male; lower lemma acute or with awns, 5-15 mm long.
A grass. It has underground stems and keeps growing from year to year. It forms tussocks. The stalks are 30-300 cm high. The flowering stalks are 10-23 cm long.
Culms 30–300 cm. high, arising from a short oblique rhizome, often wiry; ligule absent or a line of hairs; leaf laminae occasionally marked with purple bars.
Inflorescence 7–25 cm. long, lanceolate (occasionally linear); racemes 1–5 cm. long, densely crowded with appressed spikelets.
Inferior floret male, its lemma acute or with a short curved awn up to 5(15) mm. long.
Spikelets small, 1.5–2.5(3) mm. long, subglobose to elliptic, ± hispid.
Superior lemma 1.5–2.3 mm. long.
Tussocky perennial.
