R scripts for filtering geographic data

For each genus there is a unique R script used to filter and clean the original geographic data downloaded from the Global Biodiversity Information Facility (http://www.gbif.org). These scripts filter GBIF data for quality by excluding records with coordinate accuracy < 100 km, coordinates failing to match the locality description, and taxonomic misidentifications (verified by the authors and taxonomic specialists of each clade). Species’ epithets were checked against the most recently published taxonomies and synonyms and spelling errors are corrected here. Finally, coordinates outside the native species range with published monographs and online databases that report native and invaded ranges (e.g. GRIN database, http:// www.ars-grin.gov/), are identified and excluded.