| Plantaginaceae | |
Penstemon floridus subsp. austinii
| (Eastw.) D.D. Keck | Amer. Midl. Naturalist 18(5): 803 | 1937 |
| Plantaginaceae | |
Penstemon floridus var. austinii
| (Eastw.) N.H. Holmgren | Brittonia 31(1): 105 | 1979 |
| Plantaginaceae | |
Penstemon floridus subsp. floridus
| | | |
| Plantaginaceae | |
Penstemon floridus var. floridus
| | | |