| Spraguea caespitosa Rydb. | Calyptridium monospermum Greene |
| Spraguea candicifera (A.Gray) Brockman | Calyptridium umbellatum (Torr.) Greene |
| Spraguea eximia Eastw. | Calyptridium monospermum Greene |
| Spraguea hallii Rydb. | Calyptridium monospermum Greene |
| Spraguea irregularis Rydb. | Calyptridium monospermum Greene |
| Spraguea monosperma (Greene) Rydb. | Calyptridium monospermum Greene |
| Spraguea montana (M.E.Jones) A.Heller | Calyptridium umbellatum (Torr.) Greene |
| Spraguea multiceps Howell | Calyptridium umbellatum (Torr.) Greene |
| Spraguea nuda (Greene) Howell | Calyptridium umbellatum (Torr.) Greene |
| Spraguea paniculata Kellogg | Calyptridium umbellatum (Torr.) Greene |
| Spraguea pulcherrima A.Heller | Calyptridium monospermum Greene |
| Spraguea umbellata Torr. | Calyptridium umbellatum (Torr.) Greene |