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Perennial, usually caespitose or with creeping branched rhizomes, geniculate. Culms 30–100 cm high; mid-culm internodes glabrous or pubescent. Leaves auriculate; ligule to 2 mm long, ciliate; blade flat or involute, 2–10 (–25) cm long, 2–6 mm wide, abaxially glabrous to pubescent. Panicles 7–25 cm long. Spikelets 5–7 (–8) mm long. Glumes ±equal, about equalling remainder of spikelet, 4–7 mm long; lower glume keeled, 7–9-nerved; upper glume acute to obtuse, 9-nerved. Sterile florets: lemmas acute to obtuse, mucronate, 5-nerved, villous; lower lemma 4–5 mm long, shortly bearded; upper lemma 5–5.5 mm long, with scales c. 1 mm long at base. Bisexual floret: lemma 5 mm long; 5-nerved, shortly and sparsely villous; stamens 6.
Very variable perennial, rarely annual, 0.3-0.7(-1.8) m high; often rhizomatous. Leaf blade up to 7 mm wide, expanded or rolled and filiform; ligule a fringed or unfringed membrane. Inflorescence an open or contracted panicle. Spikelets 4.0-8.5 mm long; glumes ± equal, shorter than spikelet, 5-nerved. Florets 3; lower 2 florets sterile, lemmas similar in texture, sides long-hairy, first sterile lemma > 2/3 as long as second sterile lemma, second sterile lemma apex acute to truncate, commonly with a mucro or minute awn arising abruptly from central nerve, ear-like appendages at base; uppermost floret bisexual, lemma firmer than glumes; anther 2.8-6.0 mm long. Flowering time all year, but usually in spring.
Very variable perennial, rarely annual 300-700(-1 800) mm high; often rhizomatous. Leaf blade to 7 mm wide, expanded or rolled and filiform. Spikelet 4.0-8.5 mm long; glumes ± equal, shorter than spikelet; sterile lemmas similar in texture, sides long-hairy; 1st sterile lemma more than 2/3 as long as 2nd sterile lemma; 2nd sterile lemma with apex acute or truncate, commonly with a mucro or minute awn arising abruptly from central nerve, a pair of ear-like appendages present at base; anther 2.8-6.0 mm long.
Perennial, or possibly annual, up to 0.7 m high; often rhizomatous, very variable. Leaf blades filiform or up to 7 mm wide, flat or rolled. Flowers: panicle contracted; spikelets 4.0-8.5 mm long; sterile lemmas similar in texture, margins long-hairy, first > 2/3 length of 2nd, 2nd with apex acute, truncate or commonly with mucro arising abruptly from central nerve, and pair of ear-like appendages at base; Jul.-Jun. (usually spring).
Robust or weakly tufted perennial (rarely annual), up to 1 m tall. Leaf blades flat or rolled, margins often undulate; ligule an unfringed to a minutely fringed membrane. Inflorescence a lax, open panicle. Spikelets 4-8.5 mm long, green, usually tinged with pink, glumes shorter than to as long as spikelet, sterile lemmas smooth, villous, mucronate to aristate, the second with a pair of basal ear-like appendages. Mainly Jul.-Dec.
Perennial (sometimes annual) to 70 cm. Leaf blades linear-lanceolate, sometimes rolled, margins often undulate. Spikelets in an open panicle, green and pink, glumes to as long as spikelet, sterile lemmas villous, mucronate to aristate, the second with a pair of ear-like, basal appendages.
