| Boraginaceae | |
Plagiobothrys scouleri var. corallicarpus
| (Piper) I.M. Johnst. | Contr. Arnold Arbor. 3: 52 | 1932 |
| Boraginaceae | |
Plagiobothrys scouleri var. cusickii
| (Greene) L.C. Higgins | Great Basin Naturalist 39(4): 293 | 1979 [1980] |
| Boraginaceae | |
Plagiobothrys scouleri var. hirtus
| (Greene) I.M. Johnst. | Contr. Arnold Arbor. 3: 52 | 1932 |
| Boraginaceae | |
Plagiobothrys scouleri var. hispidulus
| (Greene) Dorn | Vasc. Pl. Wyoming 295 | 1988 |
| Boraginaceae | |
Plagiobothrys scouleri subsp. penicillatus
| (Greene) Á. Löve & D. Löve | Taxon 31(2): 353 | 1982 |
| Boraginaceae | |
Plagiobothrys scouleri var. penicillatus
| (Greene) Cronquist | Vasc. Pl. Pacif. N.W. 4: 241 | 1959 |
| Boraginaceae | |
Plagiobothrys scouleri var. scouleri
| | | |