Calamagrostis columbiensis Nuttall ex A. Gray nom. inval.

Calamagrostis columbiensis Nuttall ex A. Gray nom. inval. is a synonym sensu Soreng et al., 2000+ of:

Calamagrostis canadensis var. langsdorffii (Link) Inman, an accepted variety name sensu FNA Ed. Comm., 2007.