Penstemon cyanathus Hook. ssp. subglaber Pennell, a plant found frequently in northwestern Utah, southeastern Idaho, and southeastern Wyoming, is elevated to species status. A new name, Penstemon holmgrenii Clark is proposed because P. subglaber is preoccupied.
Clark, Stephen L.
"A new status for Penstemon cyananthus Hook. ssp. subglaber Pennell (Scrophulariaceae),"
Great Basin Naturalist: Vol. 37
, Article 10.
Available at: https://scholarsarchive.byu.edu/gbn/vol37/iss2/10