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Penstemon albertinus (4)	Penstemon albidus (24)	Penstemon albomarginatus (20)	Penstemon ambiguus (17)
Penstemon ambiguus var. laevissimus (10)	Penstemon anguineus (59)	Penstemon angustifolius (12)	Penstemon apaticus (1)
Penstemon arenicola (3)	Penstemon aridus (7)	Penstemon attenuatus var. palustris (8)	Penstemon azureus (26)
Penstemon azureus ssp. azureus (6)	Penstemon azureus var. angustissimus (24)	Penstemon azureus var. azureus (78)	Penstemon baccharifolius (23)
Penstemon barbatus (9)	Penstemon barbatus ssp. torreyi (11)	Penstemon barbatus var. praecox (1)	Penstemon barbatus var. torreyi (5)
Penstemon barbatus var. trichander (1)	Penstemon barnebyi (17)	Penstemon barrettiae (5)	Penstemon bicolor (18)
Penstemon bicolor ssp. bicolor (13)	Penstemon bicolor ssp. roseus (13)	Penstemon bracteatus (7)	Penstemon buckleyi (1)
Penstemon caesius (59)	Penstemon caespitosus (7)	Penstemon caespitosus var. desertipicti (8)	Penstemon calcareus (28)

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