1. AG Biodiversity and Evolution of Plants Institute of Molecular Physiology Johannes Gutenberg University Mainz 55099 Mainz Germany
2. Department of Plant and Microbial Biology University of Minnesota–Twin Cities St Paul MN 55108 USA
3. Princess Therese von Bayern Chair of Systematics, Biodiversity and Evolution of Plants Ludwig Maximilians University of Munich 80638 Munich Germany
4. School of Biological Sciences Washington State University Pullman WA 99164 USA