List of critically endangered plants

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.

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.

[3] 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.

"[4] This is a complete list of critically endangered plant species, subspecies and varieties evaluated by the IUCN.

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.