Verbatim text: Clokey, I. W. and D. D. Keck. 1939. Reconsideration of certain members of Penstemon subsection Spectabiles. Bull. S. Calif. Acad. Sci. 38: 8–13.
Author: Clokey, I.W., Keck, D.D.
Year: 1939
Title: Reconsideration of certain members of Penstemon subsection Spectabiles
Journal: Bull. S. Calif. Acad. Sci
Volume: 38
Pages: 8–13