As of December 2023, the International Union for Conservation of Nature (IUCN) lists 5702 plant species categorized as Critically Endangered, including 569 which are tagged as possibly extinct and 48 possibly extinct in the wild. 8.6% of all evaluated plant species are listed as critically endangered. The IUCN also lists 284 subspecies and varieties as critically endangered.
Additionally 5371 plant species (8.1% of those evaluated) are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN. While the category of data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed."
This is a complete list of critically endangered plant species, subspecies and varieties evaluated by the IUCN. Species considered possibly extinct by the IUCN are marked as such.
There are 24 bryophyte species assessed as critically endangered.
There are 67 species and three varieties of pteridophyte assessed as critically endangered.
There are 54 species and three varieties in the class Polypodiopsida assessed as critically endangered.
There are 49 species and three varieties in the order Polypodiales assessed as critically endangered.
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There are 81 species, five subspecies, and 13 varieties of gymnosperm assessed as critically endangered.
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There are 1895 species, 78 subspecies, and 49 varieties of dicotyledon assessed as critically endangered.
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There are 62 species and 12 subspecies in Campanulales assessed as critically endangered.
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Family Proteaceae - 103 species
Family Sabiaceae - 5 species
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There are 40 species in the order Laurales assessed as critically endangered.
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There are 29 species and two subspecies in the order Celastrales assessed as critically endangered.
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There are 97 species and five varieties in the order Myrtales assessed as critically endangered.
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There are 63 species and three subspecies in the order Magnoliales assessed as critically endangered.
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There are 30 species and one variety in Capparales assessed as critically endangered.
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There are 51 species and two varieties in the order Apiales assessed as critically endangered.
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There are 28 species and one variety in Primulales assessed as critically endangered.
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There are 145 species, two subspecies, and one variety in the order Caryophyllales assessed as critically endangered.
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There are 37 species, two subspecies, and two varieties in Cyperales assessed as critically endangered.
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