1. Institute of Bioscience and Bioresources, CNR, Bari, Italy
2. Institute of Environmental Sciences, University of Castilla-La Mancha, Toledo, Spain
3. Department of Planning, Design and Architecture Technology, Section of Environment and Landscape, Sapienza University of Rome, Roma, Italy
4. Centre alpien de Phytogéographie, Fondation J.-M. Aubert, Champex-Lac, Switzerland
5. Department of Plant Sciences, Section of Biology, University of Geneva, Chambésy, Switzerland