Rhizomatous, to 1 m, the culms scabrous below the infl, otherwise glabrous; sheaths glabrous or scaberulous; ligules 1–7+ mm, often lacerate; blades glabrous, or scabrous above, involute, 2–6 mm wide when unrolled; infl 5–15 mm, narrow and congested, sometimes lobed; glumes 2–6 mm, acute or abruptly acuminate, glabrous or scabrous; lemma scabrous, in most plants about equaling the second glume; callus-hairs copious, half to nearly as long as the lemma; awn inserted near the middle, straight or nearly so; rachilla-vestige to 1 mm, hairy throughout; 2n=28–126, apomictic at the higher ploidy-levels. Wet meadows and marshes; circumboreal, s. to N. Engl. and N.Y., Pa., W.Va., O., Ind., Mo., Ariz., and Calif. (C. inexpansa; C. neglecta)
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