Plantaginaceae | |
Penstemon rydbergii subsp. aggregatus
| (Pennell) D.D. Keck | Amer. Midl. Naturalist 33(1): 158 | 1945 |
Plantaginaceae | |
Penstemon rydbergii var. aggregatus
| (Pennell) N.H. Holmgren | Brittonia 31(1): 106 | 1979 |
Plantaginaceae | |
Penstemon rydbergii var. oreocharis
| (Greene) N.H. Holmgren | Intermount. Fl. 4: 390 | 1984 |
Plantaginaceae | |
Penstemon rydbergii subsp. rydbergii
| | | |
Plantaginaceae | |
Penstemon rydbergii var. rydbergii
| | | |
Plantaginaceae | ** |
Penstemon rydbergii subsp. typicus
| D.D. Keck | Amer. Midl. Naturalist 33(1): 158 | 1945 |
Plantaginaceae | |
Penstemon rydbergii var. varians
| (A. Nelson) Cronquist | Vasc. Pl. Pacif. N.W. 4: 402 | 1959 |