''Carex antoniensis'' is a species of grassy plants that belong to the family

Cyperaceae The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' w ...

. The species is endemic to

Cape Verde , national_anthem = () , official_languages = Portuguese , national_languages = Cape Verdean Creole , capital = Praia , coordinates = , largest_city = capital , demonym ...

, where it only occurs on the island of Santo Antão.Oromí, Martín, Zurita & Cabrera, 2005 :
Lista preliminar de especies silvestres de Cabo Verde: Hongos, Plantas y Animales Terrestres.
' Gobierno de Canarias, Consejería de Medio Ambiente y Ordenación Territorial, p. 53 It is listed as critically endangered by the IUCN. The specific name refers to the island of Santo Antão.

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