Penstemon

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