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Highly variable, tufted, erect or geniculate perennial 220-1550 mm high; hydro-to hygrophyte; rhizomatous; culms branching and rooting from lower nodes. Leaf blade 20-550 x 2-5 mm, linear, tapering to a fine point, often glaucous, ligule a conspicuous unfringed membrane to 5 mm long. Inflorescence with numerous racemes, open or contracted; spikelets not overlapping. Spikelet 6-15 mm long, 5-12-flowered; glumes unequal, 2.0-7.5 mm long, acute, keeled, upper glume acute or obtuse, minute mucro or awn present or absent; lemma 3.0-6.0 mm long, rounded on back, minutely hairy on nerves below, apex acute, toothed, mucronate or awned; anthers 0.8-1.5 mm long; caryopsis 1.6-1.8 mm long.
Hydrophytic, stoloniferous, tufted perennial, 0.22-1.55 m high; culms erect. Leaf blade 250-550 x 3-5 mm, linear, tapering to a filiform point; ligule an unfringed membrane up to 5 mm long. Inflorescence a panicle; spikelets not overlapping. Spikelets 6-14 mm long; glumes unequal, 2.5-3.2 mm long, acute, shorter than spikelet, 1-nerved; upper glume without mucro or awn. Florets 5-12; lemma 4.0-5.2 mm long, rounded on back, 3-nerved, 2-or more lobed, apex acute, mucronate or shortly awned, minutely hairy on nerves below; anther 1.0-1.5 mm long; ovary glabrous. Flowering time Oct.-May. Caryopsis 1.6-1.8 mm long, elliptic-oblong.
Spikelets 6–11-flowered, 8–15 mm long, narrowly elliptic to elliptic, slightly overlapping; glumes unequal, keeled, the inferior 2–4.5 mm long, lanceolate to narrowly lanceolate, acute or acuminate, the superior 3.3–7.5 mm long, narrowly oblong, acute or obtuse and minutely mucronate; lemmas 3.2–5.9 mm long, narrowly oblong, dorsally rounded, pilose on the nerves below, 2-or more toothed at the apex and mucronate or shortly awned.
Perennial, up to 1.5 m tall, erect or branching, often rooting at lower nodes. Leaves linear; ligule a pointed unfringed membrane. Inflorescence of several racemes on an elongated central axis. Spikelets 6-14 mm long, olive green, many-flowered, glumes unequal, shorter than spikelet, upper 1-nerved; lemmas soft, hairy on nerves below, lobed, 3-nerved, mucronate to shortly awned, awn not basally twisted.
Perennial; up to 1.55 m high; hydrophyte; rhizomatous; stoloniferous; and tufted. Leaf blades 250-550 x 3-5 mm; ligule a conspicuous membrane; up to 5 mm long; unfringed. Flowers: panicle with many racemes; spikelets 6-14 mm long; not overlapping; 5-12-flowered; lemmas rounded on back; minutely hairy on nerves below; apex acute; toothed; mucronate or awned.
Perennial, hydrophyte, rhizomatous, stoloniferous and tufted, up to 1.5 m high. Leaf blades 250-550 mm long, 3-5 mm wide; ligule a conspicuous membrane, up to 5 mm long. Spikelets 6-14 mm long. Racemes numerous; spikelets not overlapping, 5-12-flowered; lemma tips acute.
Aquatic or semi-aquatic rhizomatous perennial up to 200 cm tall, rooting and branching from the lower nodes; ligule a pointed membrane; leaf lamina 25–55 cm × 2–5 mm, tough, linear, involute, greyish-green with a broad white central nerve, tapering to a fine point.
Inflorescence 20–35 cm long, compact and cylindrical at first, later more open; racemes numerous, slender, 7–15 cm long, ± straight.
Perennial to 1.5 m. Leaves linear. Spikelets in a panicle, olive, without awns.
Caryopsis 1.6–1.8 mm long, elliptic-oblong, dorsiventrally flattened.
