1. School of Plant and Environmental Sciences Virginia Tech Blacksburg Virginia USA
2. Department of Natural Resources and Environment University of Alaska Fairbanks Alaska USA
3. Department of Biology George Mason University (MS 3E1) Fairfax Virginia USA
4. Massey Herbarium, Department of Biological Sciences Virginia Tech Blacksburg Virginia USA
5. Huck Institute of Life Sciences University Park Texas Pennsylvania USA
6. Burlington Massachusetts USA
7. Department of Statistics Virginia Tech Blacksburg Virginia USA