Verbatim text: Keck, D. D. 1938. Studies in Penstemon VI. The section Aurator. Bull. Torrey Bot. Club 65: 233–255.
Author: Keck, D.D.
Year: 1938
Title: Studies in Penstemon VI. The section Aurator
Journal: Bull. Torrey Bot. Club
Volume: 65
Pages: 233–255