1. Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland
2. Zurich‐Basel Plant Science Center Zurich Switzerland
3. Department of Plant Sciences University of Cambridge Cambridge United Kingdom
4. Boyce Thompson Institute Ithaca New York USA
5. Plant Biology Section Cornell University Ithaca New York USA
6. Institute for Biology Humboldt University of Berlin Berlin Germany
7. Späth‐Arboretum Humboldt University of Berlin Berlin Germany
8. Department of Plant and Microbial Biology University of Zurich Zurich Switzerland