This dataset contains all digitized vascular plant specimen records stewarded by the Harvard University Herbaria and collected in California, Oregon, Nevada, or Baja California. The Harvard University Herbaria, with over 5 million specimens, is the world’s largest University Herbaria. Included in the Herbaria are what were once six separate herbarium collections: * Herbarium of the Arnold Arboretum (A) * Economic Herbarium of Oakes Ames (ECON) * Oakes Ames Orchid Herbarium (AMES) * Farlow Herbarium (FH) * Gray Herbarium (GH) * New England Botanical Club Herbarium (NEBC). DarwinCore data follows the AppleCore guidance.