This study was done to 1.)record specimen label data from historical collections of new species added to the list of Plants of Special Concern in Pennsylvania 2.)continue a program to confirm taxonomic ID of POSCIP specimens 3.)conduct field surveys for POCIP species and to document new sites 4.)provide herbarium services to PNHP, WPC and other staff members and 5.)provide a peer-reviewed published checklist for Washington County.