| Spraguea caespitosa Rydb. | Calyptridium monospermum Greene |
| Spraguea hallii Rydb. | Calyptridium monospermum Greene |
| Spraguea monosperma (Greene) Rydb. | Calyptridium monospermum Greene |
| Spraguea paniculata | Calyptridium umbellatum (Torr.) Greene |
| Spraguea umbellata | Calyptridium umbellatum (Torr.) Greene |