1. Institute of Botany; University of Liege; Liege Belgium
2. Department of Botany; Swedish Museum of Natural History; Stockholm Sweden
3. Department of Ecology; Swedish University of Agricultural Sciences; Uppsala Sweden
4. Department of Ecology, Environment and Plant Sciences; Stockholm University; Stockholm Sweden
5. Island Ecology and Evolution Research Group; Instituto de Productos Naturales and Agrobiologıa (IPNA-CSIC); La Laguna Spain
6. Department of Environmental Science, Policy and Management; University of California; Berkeley California
7. Plant Conservation and Biogeography Group, Departamento de Botánica, Ecología y Fisiología Vegetal, Facultad de Ciencias; Universidad de La Laguna; Tenerife Spain
8. Swedish Species Information Centre; Swedish University of Agricultural Sciences; Uppsala Sweden