Panarctic Flora


342012 Calamagrostis canadensis (Michx.) P. Beauv.

Geography: Nearly circumboreal-polar.

Notes: The correct citation of the name Calamagrostis canadensis seems to be as above. Stebbin (1930) claimed that Beauvois' combination was a nomen nudum. His claim was countered already by Niles and Chase (1925), citing the indirect reference to Arundo canadensis in Beauvois' index (see Greene 1980: 142).

Löve and Löve (1975a) is useless as a reference to chromosome numbers for this group. They assigned all counts of 2n = 42 to C. canadensis s. str., all those of 2n = 56 to C. langsdorffii, and omitted or 'corrected' the intermediate and deviating counts. This is contrary to data from all other investigators of the group.

Greene (1980, 1984) recognized two major races as subspecies, Soreng and Greene in Soreng et al. (2003) and Marr et al. (2007) the same two as varieties. Greene listed several features that distinguish subsp. canadensis from subsp. langsdorffii and their ranges are different (but with a significant overlap in North America). There is, however, little evidence available yet to identify different parental genomes in subsp. canadensis and subsp. langsdorffii. If such ones are identified, their ranks (possibly as two species) should be reconsidered.

Higher Taxa