Laboratory of Evolutionary Botany, Institute of Biology, University of Neuchâtel, 11 rue Emile-Argand, CH-2000 Neuchâtel, Switzerland. nils.arrigo@unine.ch|Laboratory of Evolutionary Botany, Institute of Biology, University of Neuchâtel, 11 rue Emile-Argand, CH-2000 Neuchâtel, Switzerland. nils.arrigo@unine.ch|Laboratory of Evolutionary Botany, Institute of Biology, University of Neuchâtel, 11 rue Emile-Argand, CH-2000 Neuchâtel, Switzerland. nils.arrigo@unine.ch|Laboratory of Evolutionary Botany, Institute of Biology, University of Neuchâtel, 11 rue Emile-Argand, CH-2000 Neuchâtel, Switzerland. nils.arrigo@unine.ch|Laboratory of Evolutionary Botany, Institute of Biology, University of Neuchâtel, 11 rue Emile-Argand, CH-2000 Neuchâtel, Switzerland. nils.arrigo@unine.ch