| Plantaginaceae | |
Penstemon deustus var. arenarius
| (Greene) Jeps. | Man. Fl. Pl. Calif. 916 | 1925 |
| Plantaginaceae | |
Penstemon deustus subsp. deustus
| | | |
| Plantaginaceae | |
Penstemon deustus var. deustus
| | | |
| Plantaginaceae | |
Penstemon deustus subsp. heterander
| (Torr. & A. Gray) Pennell & D.D. Keck | Amer. Midl. Naturalist 23(3): 603 | 1940 |
| Plantaginaceae | |
Penstemon deustus var. heterander
| (Torr. & A. Gray) M. Peck | Man. Pl. Oregon 642 | 1941 |
| Plantaginaceae | |
Penstemon deustus var. pedicellatus
| M.E. Jones | Zoë 4(3): 281 | 1893 |
| Plantaginaceae | |
Penstemon deustus var. savagei
| L.F. Hend. | Rhodora 33(394): 206 | 1931 |
| Plantaginaceae | |
Penstemon deustus subsp. sudans
| (M.E. Jones) Pennell & D.D. Keck | Amer. Midl. Naturalist 23(3): 600 | 1940 |
| Plantaginaceae | |
Penstemon deustus var. suffrutescens
| L.F. Hend. | Rhodora 33(394): 206 | 1931 |
| Plantaginaceae | ** |
Penstemon deustus subsp. typicus
| D.D. Keck | Amer. Midl. Naturalist 23(3): 600–602 | 1940 |
| Plantaginaceae | |
Penstemon deustus subsp. variabilis
| (Suksd.) Pennell & D.D. Keck | Amer. Midl. Naturalist 23(3): 602 | 1940 |
| Plantaginaceae | |
Penstemon deustus var. variabilis
| (Suksd.) Cronquist | Vasc. Pl. Pacif. N.W. 4: 380 | 1959 |