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Perennial; culms soft, 50–200 cm. high, rambling or ascending; nodes glabrous.. Leaf-blades 10–25 cm. long, 3–15 mm. wide; ligule a line of hairs; sheaths glabrous, or pubescent above.. Inflorescence linear to lanceolate, 8–20 cm. long, typically dense with the racemes overlapping to form a head but sometimes interrupted; racemes simple, 2–4 cm. long, the spikelets closely packed.. Spikelets narrowly elliptic, 3–3.5(–4) m. long, hispid; lower glume often long, 1/4–3/4 the length of the spikelet; upper glume distinctly awned (1–6 mm.); lower floret ♂ or barren, tapering to a slender awn 3–25 mm. long; upper lemma 2.5–3 mm. long.
Perennial or rarely annual 500-2 000 mm high; hydrophyte; rhizomatous and stoloniferous. Leaf blade 100-250 x 3-15 mm; ligule a fringe of hairs, may be absent from upper leaves. Inflorescence dense, 80-200 mm long, linear to lanceolate; raceme 20-40 mm long, not neatly 4-rowed, simple, not clearly secund; spikelets closely packed. Spikelet 3.0-3.5(-4.0) x 1 mm, narrowly elliptic; lower floret male or sterile; glumes and lower lemma minutely hairy, nerves with long, rigid hairs; lower lemma with awn 3-25 mm long; upper lemma 2.5-3.0 mm long; anther 0.8-1.1 mm long.
Perennial, hydrophyte, rhizomatous and stoloniferous, up to 2 m high. Leaf blades 100-250 mm long, 3-15 mm wide; ligule a fringe of hairs, sometimes absent from upper leaves. Spikelets 3.0-3.5(-4.0) mm long, 1 mm wide. Inflorescence dense, 80-200 mm long; racemes 20-40 mm long; spikelets narrowly elliptic and closely packed; lower floret male or sterile; lower lemma with awns 3-25 mm long.
Perennial; up to 2 m high; hydrophyte; rhizomatous and stoloniferous. Leaf blades 100-250 x 3-15 mm; ligule a fringe of hairs; sometimes absent from upper leaves. Flowers: inflorescence dense; spike-like; 80-200 mm long; racemes 20-40 mm long; spikelets 3.0-3.5(-4.0) x 1 mm; narrowly elliptic and closely packed; lower floret male or sterile; lower lemma with awns 3-25 mm long.
Inflorescence 8–20 cm. long, linear to lanceolate, typically dense with the racemes overlapping to form an oblong head, but sometimes interrupted; racemes 2–4 cm. long, simple, the spikelets closely packed.
Inferior glume length of 1/4–;3/4 length of spikelet; superior glume distinctly awned (1–6 mm.).
Culms 50–200 cm. high, soft, rambling or ascending; ligule a line of hairs.
Inferior lemma tapering to a slender awn 3–25 mm. long.
Spikelets 3–3.5(4) mm. long, narrowly elliptic.
Superior lemma 2.5–3 mm. long.
Annual.
