Penstemon fruticosus (Pursh) Greene [ Penstemon crassifolius Lindl.]
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Penstemon fruticosus (Pursh) Greene [ Penstemon crassifolius Lindl.] [Scrophulariaceae]
J. Lindley, Edwards’s Bot. Reg., vol. 24 : t. 16 (1838) [S.A. Drake]