Global Working List of Exceptional Plants Coming soon! A working list of exceptional plant species. An initial list of 775 exceptional plants has been compiled using information from the Seed Information Database [link], the list of North American exceptional species compiled by Helm-Wallace (2015), targeted literature search, and expert input. It includes both threatened and non-threatened exceptional species, and currently represents 3% or less of the number of predicted exceptional species globally. Thus, this list is a working list and will require input from researchers worldwide to continue to grow. If you have information on a species that should be added to the list, or have any additional information on species that are already listed, please submit that using the form below. Updated versions of the list will be posted periodically. To add species to the Global Working List of Exceptional Plants, use the form below. To comment on a species that is already listed on the List, please send comments to [email protected].