About the Authors

Per Erixon

To whom correspondence should be addressed. E-mail: per.erixon@ebc.uu.se

Affiliations Department of Systematic Botany, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden, Department of Plant and Environmental Sciences, Göteborg University, Göteborg, Sweden

Bengt Oxelman

Affiliations Department of Systematic Botany, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden, Department of Plant and Environmental Sciences, Göteborg University, Göteborg, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PE BO. Performed the experiments: PE. Analyzed the data: PE. Contributed reagents/materials/analysis tools: PE BO. Wrote the paper: PE BO.