1. Department of Plant Biology, Ecology, and Evolution Oklahoma State University Stillwater Oklahoma USA
2. Center for Tree Science The Morton Arboretum Lisle Illinois USA
3. Department of Biological Sciences University of Notre Dame South Bend Indiana USA
4. Department of Fisheries and Wildlife Michigan State University East Lansing Michigan USA
5. Center for Conservation and Sustainable Development Missouri Botanical Garden Saint Louis Missouri USA
6. Department of Biology College of Charleston Charleston South Carolina USA
7. Department of Mathematical Sciences University of Arkansas Fayetteville Arkansas USA
8. Department of Biology Mount Royal University Calgary Alberta Canada
9. Department of Biological Sciences University of Calgary Calgary Alberta Canada