Much like no. 8 [Calamagrostis porteri A. Gray]; culms stouter; blades weakly scabrous, to 12 mm wide, light green and glaucous on both sides, the collar glabrous; 2n=56. Dry rocky woods; local in s. O. (Jackson Co.) and apparently also in s. Mo.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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