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Stout, erect, to 2 m, from hard, scaly rhizomes, often forming large tufts; ligule a dense zone of silky hairs; blades 2–5 dm, to 15 mm wide; glabrous or pilose near the base; infl open, freely branched, pyramidal, 2–4 dm; spikelets ovoid, soon widened distally by spreading of the glumes and sterile lemma, 2.2–5.6 mm; first glume half to nearly as long; second glume and sterile lemma subequal, conspicuously veined, acute to long-acuminate; 2n=18–108. Open woods, prairies, dunes, shores, and brackish marshes; N.S. and Que. to Man. and Mont., s. to Ariz., Mex
A grass. It grows 2.1 m tall. It forms large clumps and has rhizomes or underground runners. The leaf blades are 60 cm long by 6 mm wide. The flowering shoots are 50 cm long. They are open or spreading. The spikelets are 5 mm long.
