Reference:Crosswhite1967a
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Verbatim text: Crosswhite, F. S. 1967. Revision of Penstemon section Habroanthus (Scrophulariaceae) I: Conspectus. Amer. Midl. Naturalist 77: 1–11.
Author: Crosswhite, F.S.
Year: 1967
Title: Revision of Penstemon section Habroanthus (Scrophulariaceae) I: Conspectus
Journal: Amer. Midl. Naturalist
Volume: 77
Pages: 1–11