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Annuals, erect or geniculate, sometimes stoloniferous, without rhizomes. Flowering culms 37–160 cm high. Ligule a ciliate membrane, c. 1 mm long. Inflorescence branches 3–9 (–12), touching for half their length at most (when flattened), 3.5–11 cm long, 8–12 mm wide including the spikelets and awns; bare tip 3–5 mm long, 4–8% of total branch length. Spikelets elliptic to orbicular, 4–7 mm long, 3–7-flowered with 2–4 loosely overlapping bisexual florets. Glumes 1–2.2 mm long, ±equal in width; lower glume aristulate; upper glume oblong to elliptic, with awn 1.5–11 mm long. Basal lemma 3–4 mm long, awned, 3-nerved, with nerves converging towards the apex, scaberulous at least toward the apex of midnerve; awn 0.3–2 mm long. Palea flaps distinctly narrower than body. Anthers 1.3–2.5 mm long, yellow. Caryopsis broadly obovate, truncate at base, truncate to concave at apex. Incomplete lemmas awnless.
Tufted, erect, robust annual 480-1140 mm high; occasionally rooting at nodes. Leaf blades 110-450 x 5-12 mm. Inflorescence of (1)3-9 racemes, (35)55-75(110) mm long, rarely spreading. Spike-let 4.0-6.2 mm long, elliptic; lower glume keel thickened, scabrid; upper glume awn 1.5-4.0 times as long as glume body, usually glume and awn much longer than adjacent lemma body; lemma acuminate, keel scabrid, awn 0.7-2.0 mm long; anther 1.3-2.2 mm long; caryopsis triangular, apex truncate to concave; transversally rugose.
Spikelets 4–6.2 mm long, elliptic, 2–7-flowered; glumes subequal, 1.5–2.2 mm long, the inferior lanceolate to narrowly elliptic in profile with a thick scabrid keel, the superior elliptic in profile, the keel extended into a divergent scabrid awn (1.5)1.75–4 times as long as the body; lemmas 3–4 mm long, lanceolate to narrowly ovate in profile, acuminate, the keel scabrid, ± straight or slightly concave below the middle, extended into an awn-point 0.7–2 mm long; palea keels wingless; anthers 1.3–2.1 mm long.
Robust caespitose annual; culms up to 160 cm tall (rarely less than 70 cm), erect or geniculately ascending, sometimes rooting from the lower nodes; leaf laminas 11–45 cm × 5–12 mm, flat, glabrous to papillose-hispid especially along the margins.
Robust annual, tufted (erect), up to 1.1 m high. Leaf blades 110-450 mm long, 5-12 mm wide. Spikelets 4.0-6.2 mm long. Spikes 3-9.35-110 mm long; lemma keels scabrid; awns 0.7-2.0 mm long; grains triangular, apex truncate to concave.
A grass. It can form tufts and lie along the ground. It has runners. It grows 1.6 m high. The flower has 5 stalks spreading out like spokes on a wheel and these dry out and twist.
Caryopsis 0.7–1.1 mm long, broadly obovate to obtriangular, transversely rugose.
Racemes (1)3–9, 3.5–11 cm long, linear, usually ascending, rarely spreading.
