| Phellopterus bulbosus (A.Nelson) J.M.Coult. & Rose | Vesper bulbosus (A.Nelson) R.L.Hartm. & G.L.Nesom |
| Phellopterus camporum Rydb. | Vesper bulbosus (A.Nelson) R.L.Hartm. & G.L.Nesom |
| Phellopterus jonesii (J.M.Coult. & Rose) Rydb. | Rhysopterus plurijugus J.M.Coult. & Rose |
| Phellopterus macrocarpus Osterh. | Vesper montanus (Torr. & A.Gray) R.L.Hartm. & G.L.Nesom |
| Phellopterus macrorhizus (Buckley) J.M.Coult. & Rose | Vesper macrorhizus (Buckley) R.L.Hartm. & G.L.Nesom |
| Phellopterus montanus (Torr. & A.Gray) Torr. & A.Gray | Vesper montanus (Torr. & A.Gray) R.L.Hartm. & G.L.Nesom |
| Phellopterus multinervatus J.M.Coult. & Rose | Vesper multinervatus (J.M.Coult. & Rose) R.L.Hartm. |
| Phellopterus purpurascens (A.Gray) J.M.Coult. & Rose | Vesper purpurascens (A.Gray) R.L.Hartm. & G.L.Nesom |
| Phellopterus utahensis (M.E.Jones) Wooton & Standl. | Vesper bulbosus (A.Nelson) R.L.Hartm. & G.L.Nesom |