Poison oak refers to two plant species in the genus Toxicodendron, both of which can cause skin irritation: * Toxicodendron diversilobum or Western poison oak, found in western North America * Toxicodendron pubescens or Atlantic poison oak, found in the southeastern United StatesThis page is an index of articles on plant species (or higher taxonomic groups) with the same common name (vernacular name). If an internal link led you here, you may wish to edit the linking article so that it links directly to the intended article.