Coarse erect perennial; culms 1-2 m. high, succulent, scaberulous; sheaths elongate, longer than the internodes, keeled toward the summit, glabrous, pubes-cent on the collar, auriculate, the auricles sometimes hispid-ciliate; ligule 3-5 mm. long, hispid; blades mostly 30-50 cm. long, 1-3.5 cm. wide, scabrous and sparsely pubescent on both surfaces, the margins prominently hispid-scabrous; panicles 30-40 cm. long, the branches verticillate, ascending, scabrous, as much as 25 cm. long, naked toward the base; spikelets 5 mm. long, short-pedicellate, oblong, sparsely hispid, the awns 1-2 cm. long or sometimes wanting; glumes narrow, acuminate, 1 mm. long.
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A grass. It keeps growing from year to year. It grows 1-3 m tall. The flower panicle is 25-50 cm tall.
Open or semi-open habitats in low forest; rainforest; secondary forest; open woodland; undulating savannah pasture; cultivated fields; open swamps; usually in or near water such as streams, river banks and pool edges; at elevations to 700 metres.
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It is a tropical plant. In Argentina it grows below 500 m above sea level.
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