Calyptridium

{{Short description|Genus of flowering plants}}

{{Automatic taxobox

|image = Cistanthe monandra.jpg

|image_caption = Calyptridium monandrum

|taxon = Calyptridium

|authority = Nutt. (1838)

|synonyms = Spraguea {{small|Torr. (1851)}}

|synonyms_ref =

}}

Calyptridium is a genus of flowering plants belonging to the family Montiaceae.{{cite web |title=Calyptridium Nutt. {{!}} Plants of the World Online {{!}} Kew Science |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30001389-2 |website=Plants of the World Online |access-date=20 March 2021 |language=en}}

Its native range is Northern America, Southern South America.

Species:

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