Established in 2012, the Campus Arboretum at Washington & Jefferson College encompasses the entire 85 acres of urban campus and athletic facilities. All of the nearly 1,200 trees from 83 species are accessioned and evaluated, with over 930 trees bearing metal tags with accession number and family, scientific, and common names. Particularly noteworthy trees include a mature American elm (Ulmus americana), a mature willow oak (Quercus phellos), and five mature osage-orange (Maclura pomifera) from an historical property line separating the College from the former Washington Female Seminary.