Penstemon fruticosus (Pursh) Greene [ Penstemon scouleri Douglas ex Lindl.]
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Penstemon fruticosus (Pursh) Greene [ Penstemon scouleri Douglas ex Lindl.] [Scrophulariaceae]
J. Lindley, Edwards’s Bot. Reg., vol. 15 : t. 1277 (1829) [M. Hart]