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Loosely tufted, slender annual 120-800 mm high; culm node glabrous. Leaf blade 50-300 x (3)5-11 (-18) mm, broadly linear to narrowly lanceolate, at least lower ones pseudopetiolate, base sagittate with lobes minute or to 30 mm long or absent (variable on same plant). Inflorescence open, spikelets secund; each spikelet subtended by a solitary bristle 4-10 mm long, scabrid, green flushed purple. Spikelet 2 x 1-2 mm, laterally compressed; lower glume 3-nerved; lower lemma grooved in middle; upper lemma conspicuously gibbous, keeled, finely and densely rugose though apex often smooth.
Slender annual, loosely tufted, up to 0.8 m high. Leaf blades 50-300 mm long, (3-)5-11(-18) mm wide, leaf blades (at least lower ones) pseudopetiolate, bases sagittate with lobes 2-30 mm long. Culm nodes glabrous. Spikelets 2 mm long, 1-2 mm wide. Panicle open, racemes secund; bristles solitary; lower glume 3-nerved; lower lemma rugose.
Panicle 5–15 cm. long, narrowly oblong to ovate, the spikelets secund along scaberulous raceme-like primary branches; bristles 2–15 mm. long.
Leaf laminae broadly linear to narrowly lanceolate, at least the lower leaves falsely petiolate and sagittate with lobes 2–30 mm. long.
Spikelets 2 mm. long, suborbicular, laterally compressed.
Inferior glume 1/3, the superior 1/2 length of spikelet.
Superior lemma conspicuously gibbous, keeled, rugose.
Culms 20–80 cm. high.
Weak-stemmed annual.
