Moreover, they are likely to be located within known concentrations of species with small ranges, in areas like Central America, the Caribbean, the northern Andes, Brazil’s coastal forests, southern Africa, Madagascar, Southeast Asia, New Guinea, Western Australia, and many tropical islands. Given that most plants that are currently threatened with extinction – 20% of known species, and probably 30% of all species – fall within this category, efforts to preserve plant biodiversity should emphasize such concentrations of small-range species.