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Annual. Culms slender or rarely robust, 9–71 cm high. Leaf blades linear, 8.5–23 cm long, 3–14 mm wide, not grooved. Panicles 0.5–4 cm long. Sterile spikelets persistent, strongly laterally compressed, 6–8.1 mm long; lemma with awn 2.6–7.7 mm long, with margins scabrous and intercostal regions sparsely scabrous. Bisexual spikelets subsessile, cuneate, 5.5–9.4 mm long, with 1–3 bisexual florets; glumes about equalling remainder of spikelet, subulate, shortly awned; lower glume 5.5–8.5 mm long, acuminate, 1-nerved; upper glume 6.4–8.9 mm long; basal lemma slightly dorsally compressed, 5–6.8 mm long, acute, chartaceous; lemma awn usually longer than body, 5–18 mm long, apical or from a sinus. Caryopsis ellipsoid, ventrally compressed; hilum linear.
Tufted annual, 200-600 mm high; culm erect or decumbent at base. Leaf blade 50-150 x 3-10 mm; ligule an unfringed membrane. Inflorescence a bristly, ovoid, secund panicle; spikelets paired, dissimilar, bisexual spikelets mixed and ± concealed by sterile ones; fertile spikelets subsessile or shortly pedicelled. Fertile spikelet 8-14 mm long, laterally compressed; glumes ± equal, 7-12 mm long, very finely pointed, 1-nerved. Florets 1-5; lemma 5-7 mm long, rounded on back, awn straight, untwisted; anther 3-4 mm long. Sterile spikelet 7-13 mm long; glumes and lemmas with pale awns up to 15 mm long. Flowering time July-Jan.
Tufted annual 200-700 mm high; culm erect or decumbent at base. Leaf blade 50-150 x 3-10 mm. Inflorescence oblong to ovate sometimes globose. Spikelet awns pale, rarely purple. Fertile spikelet 7-20 mm long; glumes and lemmas dissimilar; glume 5.5-12.0 mm long, awned; lemma 4-7 mm long (excluding awns), rounded on back; awn straight; anther 1.5-3.0 mm long. Sterile spikelet 7-13 mm long; glumes and lemmas awned; awns pale rarely purple, all appear short and end ± at the same height or becoming shorter in a regular way up spikelet, so that spikelet sides appears neat and regular.
Annual; up to 0.6 m high; tufted. Culms erect or decumbent at base. Leaf blades 50-150 x 3-10 mm. Flowers: panicle compacted; spikelets 7-20 mm long; female-fertile spikelets 2-or 3-flowered; glumes and lemmas of sterile spikelets produced into pale awns up to 15 mm long; glumes 7-12 mm long; lemmas 5-7 mm long; anthers 3-4 mm long.
Annual to 60 cm. Leaves linear. Spikelets in a congested, softly bristly panicle, sexually dimorphic, 2-or 3-flowered, anthers 3-4 mm long.
Like C. coloratus but plants up to 0.6 m tall, sterile spikelets 2-5-flowered, lemmas 5-7 mm long and awns 6-16 mm long.
