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Revision of Penstemon (Sect. PENSTEMON) series GRACILES (Scrophulariaceae), with a synopsis of the genus.

APA Citation

Crosswhite, F. Samuel. (1965). Revision of Penstemon (Sect. PENSTEMON) series GRACILES (Scrophulariaceae), with a synopsis of the genus. .

Crosswhite, Frank Samuel. Revision of Penstemon (Sect. PENSTEMON) Series GRACILES (Scrophulariaceae), With a Synopsis of the Genus. , 1965.

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