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Annual 150-300 mm high; culms solitary or loosely tufted, nodes pubescent. Leaf blade 5-140 x 1.0-4.5 mm, puberulous, pale to dark green. Inflorescence pale green, often only apex of spikelet purple, rarely purple throughout. Spikelet 3-4 mm long; lower glume awn to 1 mm long, 1-nerved; upper glume awn 2-6 mm long; upper floret sterile; upper lemma awn hooked, barely projecting beyond apices of glumes; anther 0.5-0.6 mm long.
Annual, up to 300 mm tall. Leaves linear, shortly hairy; ligule a fringed membrane covered with hairs. Inflorescence a contracted, dense panicle. Spikelets 3-4 mm long, 2-flowered, pale green sometimes flushed purple; glumes longer than spikelet, hairy on keel and margins, awn of upper glume 2-6 mm; lower floret fertile, usually firm and shiny; upper floret sterile, lemma awned, awn stout and bent; anthers ± 0.5 mm long.
Annual to 30 cm. Leaves linear, shortly hairy. Spikelets in a panicle, pale green, upper glume awn 2-6 mm.
