Calamagrostis michauxii Trinius ex Steudel nom. illeg.

Calamagrostis michauxii Trinius ex Steudel nom. illeg. is a synonym sensu Soreng et al., 2000+ of:

Calamagrostis canadensis (Michaux) Palisot de Beauvois var. canadensis, an accepted variety name sensu FNA Ed. Comm., 2007.