Reference:Keck1945a
Verbatim text: Keck, D. D. 1945. Studies in Penstemon VIII. A cyto-taxomonic account of the section Spermunculus. Amer. Midl. Naturalist 33: 128–206.
Author: Keck, D.D.
Year: 1945
Title: Studies in Penstemon VIII. A cyto-taxomonic account of the section Spermunculus
Journal: Amer. Midl. Naturalist
Volume: 33
Pages: 128–206