| Ferula caruifolia | Lomatium caruifolium (Hook. & Arn.) J.M.Coult. & Rose |
| Ferula foeniculacea | Lomatium foeniculaceum (Nutt.) J.M.Coult. & Rose |
| Ferula newberryi | Cymopterus newberryi (S.Watson) M.E.Jones |
| Ferula purpurea | Lomatium columbianum Mathias & Constance |