Endangered and Threatened Wildlife and Plants; Determination of Endangered Status for Three Plants From the Channel Islands of Southern California

The Fish and Wildlife Service (Service) determines Cercocarpus traskiae (Catalina Island mountain-mahogany), Lithophragma maximum (San Clemente Island woodland-star), and Sibara filifolia (Santa Cruz Island rockcress) to be endangered throughout their respective historical ranges on the Channel Islands of southwestern California, pursuant to the Endangered Species Act of 1973, as amended (Act). Cercocarpus traskiae is found primarily in coastal scrub habitats on Santa Catalina Island. Lithophragma maximum is found in rock crevices within coastal bluff scrub on San Clemente Island. Sibara filifolia is found on talus slopes in coastal scrub on San Clemente Island and may still occur on Santa Catalina Island, although the last sighting of the species on that island was in 1973. These plants are threatened by a variety of factors including grazing, fire, competition from non-native plant species, erosion, and hybridization. This rule implements the Federal protection provisions afforded by the Act for these three plant species.