This northern (circumboreal) species is not confirmed in Ky. It extends south to Tenn. and N.C., at high elevation (W). It has been mapped in Ky. by FNA 23 and K but verified colls. remain unknown. A putative coll. from HEND (USU) lacks label data and who verified. A putative coll. from BELL (TENN) has lost its inflorescence. Colls. that have been reported (M) from LETC (APSC, ?NCU/DUKE) were misidentified arundinacea. C. latifolia differs from arundinaceae as follows (FNA 23; W): spikelets mostly 2.5-4 mm long (versus 4-6 mm), glumes at least the lower, mostly glistening (versus rather dull), hyaline except the midrib (versus only along a narrow margin), the upper glume 2.6-4.1 mm long (versus 4.1-6.6 mm), 1-nerved or rarely 3-nerved (versus prominently 3-nerved). There is substantial overlap of ranges in the southern Appakachians and further north. Hybrids might be expected but are not documented; reported 2n = 28 in both species.