Calyptridium roseum S.Watson species accepted

Calyptridium arizonicum (J.T.Howell) M.G.Simpson, M.Silveira & Guilliams species accepted

Calyptridium hesseae (J.H.Thomas) Hershk. species accepted

Calyptridium martirense (Guilliams, M.G.Simpson & Rebman) Hershk. species accepted

Calyptridium monandrum Nutt. species accepted

Calyptridium monospermum Greene species accepted

Calyptridium nevadense (J.T.Howell) Hershk. species accepted

Calyptridium parryi A.Gray species accepted

Calyptridium pulchellum (Eastw.) Hoover species accepted

Calyptridium pygmaeum Parish ex Rydb. species accepted

Calyptridium quadripetalum S.Watson species accepted

Calyptridium umbellatum (Torr.) Greene species accepted