Some of the more robust colls. below sandstone cliffs in se. Ky. that have been determined as communis are transferred here to amplisquama. This is a southern Appalachian taxon that is rather little known, and W et al. have recently doubted its status as a species. C. amplisquama reportedly differs (FNA 23) in its generally broader leaves (mostly 2-5 mm versus 1-3 mm); its inflorescences relatively long (usually 4-6 cm versus 2.5-4 cm) and pale (versus often purplish); its relatively long basal bracts (often extending to the staminate tip versus up to half as long); its perigynia with wider scales (>1.6 mm versus usually <1.6 mm) and perhaps longer teeth (usually >0.2 mm versus usually 0.1-0.2 mm).