Calamagrostis purpurascens subsp. tasuensis Calder & Roy L. Taylor

Calamagrostis purpurascens subsp. tasuensis Calder & Roy L. Taylor is a synonym sensu FNA Ed. Comm., 2007 of:

Calamagrostis sesquiflora (Trinius) Tzelev, an accepted species name sensu FNA Ed. Comm., 2007.