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Reed-like, tufted perennial 1 000-4 000 mm high; hydrophyte; rhizomatous and stoloniferous; culm robust. Leaf blade 80-600 x 5-20 mm; ligule a fringe of hairs, may be absent in upper leaves. Inflorescence (150-)200(-400) mm long, ovate to narrowly lanceolate; racemes 25-35 mm long, not neatly 4-rowed, simple or compound. Spikelet 2.5-4.0 x 1.0-1.8 mm, narrowly ovate to broadly elliptic, glabrous to hispid; glumes and lower lemma minutely hispid at least near margins, nerves usually with long, rigid hispid hairs; lower floret male; lower lemma awnless, apex 3 mm long, acute to acuminate; upper lemma 2 to 3 mm long; anther 0.6-2.1 mm long.
Reed-like rhizomatous perennial; culms robust, 1–4 m. high, firm, erect.. Leaf-blades 8–60 cm. long or more, 2–25 mm. wide, stiff, glaucous; ligule a line of hairs; sheaths glabrous or hispid.. Inflorescence ovate to narrowly lanceolate with the racemes overlapping, or linear with the racemes ± distant, 8–40 cm. long, their rhachis glabrous or pilose; racemes simple or compound, 3–20 cm. long, straight, ascending, coarsely spiculate.. Spikelets narrowly ovate to broadly elliptic, plump, 2.5–3.5(–4) mm. long, glabrous to hispid; lower lemma acute to acuminate, rarely with a subulate awn-point up to 3 mm. long; upper lemma 2–3 mm. long.
Perennial, hydrophyte, rhizomatous, stoloniferous and tufted, up to 4 m high. Leaf blades 80-600 mm long, 5-20 mm wide; ligule a fringe of hairs, sometimes absent in upper leaves. Culms robust. Spikelets 2.5-4.0 mm long, 1.0-1.8 mm wide. Inflorescence (150-)200 (-400) mm long; racemes simple or compound, 25-35 mm long; lower floret male; lower lemma awnless, tip acute to acuminate, 3 mm long.
Inflorescence 8–40 cm. long, ovate to narrowly lanceolate with numerous overlapping racemes or linear with 4–10 ± distant appressed racemes; racemes 2–20 cm. long, simple or compound, straight, ascending, coarsely spiculate.
A tall swamp grass. It grows up to 5 m high. It is like a reed and keeps growing from year to year. It has rhizomes or underground stems. The stems are solid.
A robust rhizomatous perennial up to 3·5 m. high, somewhat variable in size of spikelets and density of panicle
Spikelets 2.5–3.5(4) mm. long, narrowly ovate to broadly elliptic, plump, glabrous to hispid.
Inferior lemma acute to acuminate, rarely with a subulate point up to 2 mm. long.
Culms robust, 1–4 m. high, firm, erect; ligule a line of hairs.
Reed-like rhizomatous perennial.
Superior lemma 2–3 mm. long.
