Calamagrostis canadensis var. dubia (Scribner & Tweedy) Vasey

Calamagrostis canadensis var. dubia (Scribner & Tweedy) Vasey is a synonym sensu TROPICOS of:

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