Verbatim text: Sutherland, D. M. 1988. Historical notes on collections and taxonomy of Penstemon haydenii S. Wats. (blowout penstemon), Nebraska’s only endemic plant species. Trans. Nebraska Acad. Sci. 16: 191–194.
Author: Sutherland, D.M.
Year: 1988
Title: Historical notes on collections and taxonomy of Penstemon haydenii S. Wats. (blowout penstemon), Nebraska’s only endemic plant species
Journal: Trans. Nebraska Acad. Sci
Volume: 16
Pages: 191–194