1. Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA.
2. Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA.
3. Perot Museum of Nature and Science, 2201 N. Field Street, Dallas, TX 75201, USA.
4. Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA.
5. Department of Environmental and Plant Biology, Ohio University, Athens, OH 45701, USA.