Taxonomy and nomenclature of rough fescues, Festuca altaica, F. campestris (F. scabrella var. major), and F. hallii, in Canada and the adjacent part of United States

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Abstract
Three species of rough fescues occur in Canada and the adjacent part of the USA: F. altaica, F. campestris (F. scabrella var. major), and F. halli. F. altaica, a wide-ranging species of eastern Asia and northern North America, extends southward in the Canadian Cordillera to about latitude 52.degree.N and is disjunct in eastern Canada (northern Quebec, Gaspe Peninsula, western Newfoundland, etc.). F. scabrella Torr. in Hook. is a synonym of the earlier published F. altaica Trin. in Ledeb. Rough fescues of southern British Columbia, the southern prairie provinces of Canada, and northwestern USA that have been called F. scabrella belong to F. campestris and F. halli, a neglected species. A key to the 3 taxa and a map of their distribution is presented.