1. Faculty of Geosciences and Environment and Department of Ecology and Evolution (Faculty of Biology and Medicine), University of Lausanne, Bâtiment Biophore, CH‐1015 Lausanne, Switzerland;
2. Institute of Geobotany, Leibniz University of Hannover, Nienburger Str 17, DE‐30167 Hannover, Germany;
3. UMR INRA‐UHP 1137 Forest Ecology and Ecophysiology Unit, Phytoecology team, INRA Nancy, FR‐54280 Champenoux, France;
4. University of Zurich, Institute of Systematic Botany, Herbarium, Zollikerstrasse 107, CH‐8008 Zurich, Switzerland;
5. Department of Geography, Physical Geography Division, University of Zurich‐Irchel, Winterthurerstr. 190, CH‐8057 Zurich, Switzerland;
6. Department of Plant Ecology, University of Bayreuth, DE‐95440 Bayreuth, Germany;