Coarse perennial; culms 1-2.5 m. high, erect, in rather large clumps, glabrous; sheaths usually shorter than the internodes or the lower ones overlapping, broad, loose, keeled toward the summit, glabrous; ligule 1-1.5 mm. long, minutely erose-ciliate; blades elongate, 2-5 mm. wide, the lower surface glabrous or the midnerve scabrous, the upper pubescent, the margins very scabrous, especially near the tip; flowering branches numerous from the upper sheaths, very compound, forming a very dense, corymbose feathery inflorescence; racemes paired, 2-3 cm. long, partly enclosed or exserted on long slender peduncles from the narrow inconspicuous spathes, the rachis and sterile pedicels densely hairy, the hairs spreading, as much as 5 mm. long; sessile spikelet 3 mm. long, awnless, glabrous; pedicellate spikelet rudimentary, or occasionally larger than the sessile one.
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