We, the U.S. Fish and Wildlife Service (Service), list 23 species on the island of Oahu in the Hawaiian Islands as endangered under the Endangered Species Act of 1973, as amended (Act). We also designate 42,804 acres (17,322 hectares) as critical habitat. This designation includes critical habitat for these 23 species, 2 plant species that are already listed as endangered, and revised critical habitat for 99 plant species that are already listed as endangered or threatened. In this final rule we are also recognizing taxonomic revision of the scientific names of nine plant species and revising the List of Endangered and Threatened Plants accordingly. This final rule will implement the Federal protections provided by the Act.