1. Denver Botanic Gardens, 909 York Street, Denver, CO 80206, USA
2. Staatliches Museum für Naturkunde Stuttgart, Rosenstein 1, 70191 Stuttgart, Germany
3. Department of Tropical Plant and Soil Sciences, University of Hawaiʻi at Mānoa, 3190 Maile Way, St. John 102, Honolulu, HI 96822, USA
4. Department of Ecology and Evolutionary Biology, University of Tennessee, Dabney Hall, 1416 Circle Drive, Knoxville, TN 37996, USA
5. Department of Biological Sciences, California State University East Bay, 25800 Carlos Bee Blvd., Hayward, CA 94542, USA
6. Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL 60022, USA
7. Biology Department, University of Wisconsin-La Crosse, 1725 State Street, La Crosse, WI 54601, USA
8. Department of Biology, The University of Iowa, Iowa City, IA 52245, USA
9. Royal Holloway College, University of London, London WC1E 7HU, UK
10. Plantentuin Meise, Nieuwelaan 38, B-1860 Meise, Belgium