Penstemon
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Penstemon 'Evelyn'
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Penstemon 'Garnet'
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Penstemon albertinus Greene.
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Penstemon angustifolius Nutt. ex Pursh 'Schonholzeri'
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Penstemon arkansanus Pennell
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Penstemon attenuatus Douglas
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Penstemon auriberbis Pennell
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Penstemon azureus Benth.
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Penstemon barbatus (Cavanilles) Rothrock
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Penstemon barbatus (Cavanilles) Rothrock 'Praecox Nanus'
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Penstemon barrettae Gray
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Penstemon buckleyi Pennell
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Penstemon caespitosus Nutt. ex A. Gray.
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Penstemon campanulatus (Cav.) Willd.
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Penstemon cardwellii T. J. Howell.
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Penstemon centranthifolius (Benth.) Benth.
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Penstemon cinicola Keck
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Penstemon confertus Douglas
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Penstemon davidsonii Greene
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Penstemon davidsonii Greene var. menziesii (D.D.Keck) Cronquist
