Synonyms
Penstemon cephalanthus Pennell
Penstemon nelsoniae D.D.Keck & Thomps.
Penstemon veronicifolius Greene
Penstemon attenuatus var. hyacinthinus (Pennell) M.Peck
Penstemon attenuatus var. glabratus G.N.Jones
Penstemon attenuatus subsp. hyacinthinus Pennell
Penstemon attenuatus f. multicolor Pennell