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Loosely tufted, short-lived perennial or annual 130-750 mm high; culms erect. Leaf blade 100-240 x 2-4 mm. Inflorescence (40)50-80 mm long, a spike-like raceme, solitary or rarely paired. Spikelet 3.5-5.0 mm long; 4-6-flowered; glumes 2.8-5.0 mm long, persistent, often tinged purplish; lemma 4.0-6.5 mm long, obovate-triangular in side view, coriaceous, keeled; awn 3-11 mm long; anther 1.4-2.5 mm long; caryopsis 1.8-3.0 mm long, oblong.
Spikelets 4–7-flowered, the lowermost 3–4 florets fertile and awned, the remainder sterile and awnless; glumes ovate-lanceolate, acute, acuminate or rarely awned, the inferior 2.8–4 mm long, the superior 3.2–4.2 mm long; lemmas obovate-triangular in profile, 5–5.8 mm long, shortly ciliate along the nerves or subglabrous, with an awn 5.4–10 mm long; anthers minute, c. 0.15 mm long.
Short-lived perennial or annual, loosely tufted (culms erect or ascending), up to 0.75 m high. Leaf blades 100-240 mm long, 2-4 mm wide. Spikelets 3.5-5.0 mm long. Spikes solitary (seldom paired); spikelets 5-or 6-flowered; glumes persistent, 3-5 mm long; lemma coriaceous, 4.0-6.5 mm long, keeled; awns 3-11 mm long.
Annual or short-lived perennial, the culms loosely caespitose, erect or ascending, up to 60 cm tall; leaf sheaths loosely flabellate at the base; leaf laminas 5–22 cm × 2–4 mm.
Racemes solitary or paired, 5–8 cm long.
Caryopsis oblong, 1.8–3 mm long.
