Calyptridium is a genus of flowering plants belonging to the family Montiaceae.

Its native range is Northern America, Southern South America.

Species:

• Calyptridium hesseae (J.H.Thomas) Hershk., syn. Calyptridium parryi var. hesseae J.H.Thomas
• Calyptridium martirense (Guilliams, M.G.Simpson & Rebman) Hershk.
• Calyptridium monandrum Nutt.
• Calyptridium monospermum Greene
• Calyptridium nevadense (J.T.Howell) Hershk.
• Calyptridium parryi A.Gray, including Calyptridium arizonicum (J.T.Howell) M.G.Simpson, M.Silveira & Guilliams, syn. Calyptridium parryi var. arizonicum
• Calyptridium pulchellum (Eastw.) Hoover
• Calyptridium pygmaeum Parish ex Rydb.
• Calyptridium quadripetalum S.Watson
• Calyptridium roseum S.Watson
• Calyptridium umbellatum (Torr.) Greene

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