Synonyms
Penstemon washoensis Greene
Penstemon confertus var. attenuatus M.E.Jones
Penstemon lassenianus Greene
Penstemon confertus var. caeruleopurpureus A.Gray
Penstemon depressus Greene
Penstemon confertus var. rigidus Jeps.
Penstemon confertus var. violaceus Trautv.