Coarse perennial; culms in large tufts, erect or geniculate and rooting at the lower nodes, branching, as much as 2 m. high, glabrous; sheaths usually much longer than the internodes, compressed, keeled, glabrous to rather densely hirsute, with a dense hispid line on the collar; ligule densely hispid, 2 mm. long; blades as much as 50 cm. long, 2-3.5 cm. wide, acuminate, narrowed to a usually rather long, often petiolate base, scabrous, especially on the lower surface, the margins sharply scabrous; panicles 15-30 cm. long, as much as 6 cm. wide including the bristles, somewhat narrowed toward the apex, the axis densely villous, the branches slender, compound, crowded, ascending or spreading; bristles 1 to 2 below each spikelet, 1-2 cm. long, yellowish or brownish; spikelets 2-2.5 mm. long; first glume obtuse or acutish, 3-nerved, about half as long as the spikelet, the second obtuse, 7-nerved, about two-thirds as long as the spikelet; sterile lemma as long as the spikelet, 5-nerved; fruit rather strongly transversely rugose, acute, minutely crested.
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A herb. It is a grass that keeps growing from year to year. It grows 50-150 cm above sea level. The stalks are 2-3 mm across. The leaves are 15-30 cm long by 1-3 cm wide.
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