Synonyms
Penstemon rex A.Nelson & J.F.Macbr.
Penstemon deserticola Piper
Penstemon pilifer A.Heller
Penstemon glaber var. speciosus (Douglas) Regel
Penstemon speciosus var. pilifer (A.Heller) Munz & I.M.Johnst.
Penstemon kennedyi A.Nelson
Penstemon speciosus subsp. typicus D.D.Keck
Penstemon speciosus subsp. kennedyi (A.Nelson) D.D.Keck
Penstemon glaber f. speciosus (Douglas) Voss