This project is made possible by the generous cooperation of the International Association for Plant Taxonomy (IAPT).
Funded by the Atherton Seidell Endowment Fund of the Smithsonian Institution.
Thanks also to those who assisted with the project:
- International Association for Plant Taxonomy: Tod Stuessy, Franz Stadler
- Natural History Museum, Vienna: Heimo Rainer
- Harvard University Botany Libraries: Judy Warnement
- Missouri Botanical Garden: Doug Holland, Chris Freeland
- New York Botanical Garden: Susan Fraser, Don Wheeler
- Smithsonian Institution, National Museum of Natural History, Department of Botany: Larry Dorr