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Family!Scientific Name AuthorReferenceDate
Plantaginaceae  Penstemon gairdneri subsp. gairdneri    
Plantaginaceae  Penstemon gairdneri var. gairdneri    
Plantaginaceae  Penstemon gairdneri subsp. hians (Piper) D.D. KeckAmer. Midl. Naturalist 23(3): 5971940
Plantaginaceae  Penstemon gairdneri var. hians PiperBull. Torrey Bot. Club 27(7): 396–3971900
Plantaginaceae  Penstemon gairdneri subsp. oreganus (A. Gray) D.D. KeckAmer. Midl. Naturalist 23(3): 5961940
Plantaginaceae  Penstemon gairdneri var. oreganus A. GraySyn. Fl. N. Amer. (ed. 2) 2(1): 4411886
Plantaginaceae** Penstemon gairdneri subsp. typicus D.D. KeckAmer. Midl. Naturalist 23(3): 5971940
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