Estimating the Size of the World's Threatened Flora

摘要: ). Here we estimate themissing tropical data from global patternsof plant endemism. The results suggest thatas many as half of the world’s speciesmay qualify threatened with extinctionunder World Conservation Union(IUCN) classification scheme.Comprehensive Red Lists for plants areavailable only a scattering tropicalcountries, making it difficult to assess thetrue scale conservation crisisfor plants. We have approximated miss-ing by observing that num-ber species endemic country isa reasonable proxy number glo-bally in coun-try. In European countries, former is astrong predictor latter (