Verbatim text: Crosswhite, F. S. 1965b. Revision of Penstemon section Penstemon Scrophulariaceae II. A western alliance in series Graciles. Amer. Midl. Naturalist 74: 429–442.
Author: Crosswhite, F.S.
Year: 1965b
Title: Revision of Penstemon section Penstemon Scrophulariaceae II. A western alliance in series Graciles
Journal: Amer. Midl. Naturalist
Volume: 74
Pages: 429–442