Reference:Keck1937b
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Verbatim text: Keck, D. D. 1937b. Studies in Penstemon V. The section Peltanthera. Amer. Midl. Naturalist 18: 790–829.
Author: Keck, D.D.
Year: 1937b
Title: Studies in Penstemon V. The section Peltanthera
Journal: Amer. Midl. Naturalist
Volume: 18
Pages: 790–829