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Perennial, 300-400(-600) mm high; mat-forming, hydro-to hygrophyte; shortly rhizomatous or stoloniferous or rooting at nodes below water level and branching above; internodes short, branching at most nodes; culm nodes glabrous. Leaf blade 40-90 x 2-4 mm; ligule an unfringed membrane. Inflorescence digitate to subdigitate, usually of 2 (rarely more) secund racemes; rachis dorsally flat, with a raised midrib on front, bearing single spikelets alternately on either side of midrib in 2 or 4 rows; lower glume abaxial, upper lemma facing rachis. Spikelets 3.0-4.5 x 0.9-1.5 mm, lanceolate, apices acute, dorsiventrally compressed, awnless, usually pale brownish green, glabrous; glumes unequal; lower glume absent or reduced to a rim; upper glume 5-nerved. Florets 2; lower floret sterile, lemma equal, similar to upper glume but flat on back, median nerve present; upper floret bisexual, lemma hard, obtuse, entire, median nerve present, smooth, pallid at maturity, margins narrow and inrolled, clasping only edges of palea; anther 1.6-2.0 mm long. Flowering time Dec.-Apr.
Rhizomatous stoloniferous perennial; culms 10-60 cm. high, erect or ascend-ing, strongly compressed, simple or branching, glabrous; stolons as much as 1 m. long, slender to rather stout with short internodes, the sheaths bladeless or with short reflexed blades; sheaths of the culms longer than the internodes, loose, keeled, pilose in the throat; ligule membranaceous, about 0.5 mm. long; blades 2.5-15 cm. long, commonly about 10 cm., 3-8 mm. wide, narrower than the mouth of the sheath, gradually narrowed to a more or less involute tip, conspicuously dis-tichous; racemes 1.5-7.5 cm. long, usually 2, sometimes 3-5, conjugate or approxi-mate, erect to spreading or reflexed, somewhat falcate; spikelets 3-4.5 mm. long, solitary, imbricate, acute, glabrous, the first glume rarely developed; second glume and sterile lemma equal, thin, the lemma transversely undulate; fruit 2.5-3 mm. long, obovate, acute.
Perennial with short rhizome and long stolons. Culms solitary or tufted, many-noded, 10–50 cm tall. Leaf sheaths imbricate, often keeled, margins membranous; leaf blades distichous, linear, rather stiffly ascending, 2.5–15 × 0.3–0.8 cm, apex acute; ligule 0.5–1 mm. Inflorescence of (1–)2(–3) racemes arising together at culm apex; racemes 2–5 cm, usually closely approximate when young, later spreading; spikelets single, in 2 rows; rachis 1–2 mm wide. Spikelets pale brownish green, narrowly lanceolate-oblong, strongly flattened, 3.5–4 mm, acute; lower glume absent or rarely a tiny vestige; upper glume thinly papery, weakly 5-veined, midvein often suppressed, glabrous; lower lemma resembling upper glume; upper lemma pale green, 2.5–3 mm, shorter than spikelet, cartilaginous, apex minutely pubescent. Fl. and fr. Jun–Sep.
Perennial 300-400(-600) mm high; mat-forming, hydrophyte; shortly rhizomatous or stoloniferous or rooting at the nodes below water level and branching above; internodes short, branching at most nodes; culm nodes glabrous. Leaf blade 40-90 x 2-3(-4) mm; ligule 2-5 mm long, conspicuous. Inflorescence usually of two racemes (rarely more); spikelets arranged in two rows, secund. Spikelet 3.0-4.5 x 0.9-1.5 mm, lanceolate with apex acute, usually pale brownish-green, glabrous; lower glume absent or reduced to a rim; upper glume 5-nerved; upper lemma smooth, pallid at maturity; anther 1.6-2.0 mm long.
Stoloniferous perennial, extensively creeping; culms 8–60 cm. high.. Leaf-blades 2.5–15 cm. long, 3–8 mm. wide, stiffly ascending.. Inflorescence composed of 2(–5) conjugate racemes, each raceme 1.5–7.5 cm. long, the spikelets borne singly in 2 rows on a winged rhachis 1–2 mm. wide.. Spikelets narrowly ovate-elliptic, 3–4.5 mm. long, markedly flattened, usually pale brownish green; lower glume very rarely present as a tiny scale; upper glume and lower lemma as long as the spikelet, thinly papery, glabrous, the midnerve commonly suppressed; upper lemma smooth, pallid at maturity.
Perennial; up to 0.6 m high; hydrophyte; rooting at nodes below water level; branching above; or shortly rhizomatous; or stoloniferous. Culms mat-forming. Leaf blades 40-90 x 2-3(-4) mm. Flowers: inflorescence digitate; racemes 2; spikelets 3.0-4.5 x 0.9-1.5 mm; arranged in 2 rows; glabrous; lanceolate with apices acute; internodes short; branching at most nodes; lower glume absent or reduced to rim; upper glume glabrous.
Racemes paired (rarely up to 5), each 1.5–7.5 cm. long, the spikelets borne singly in 2 rows on a rhachis 1–2 mm. wide.
Spikelets 3–4.5 mm. long, narrowly ovate-elliptic, markedly flattened, usually pale brownish green.
Inferior glume very rarely present as a tiny scale. Superior glume thinly papery, glabrous.
Like P. distichum but upper glume glabrous, spikelets 3.0-4.5 mm long, lanceolate.
Inferior lemma thinly papery. Superior lemma pallid at maturity.
A stoloniferous creeping grass 30–60 cm. high
Creeping stoloniferous perennial.
Culms 8–60 cm. high.
