in some classifications: comprising those members of the genus Rhus having foliage that is poisonous to the touch; of North America and northern South America

Toxicodendron is a genus of woody trees, shrubs and vines in the Anacardiaceae or Sumac Family. All members of the genus produce the skin-irritating oil urushiol, which can cause a severe allergic reaction; hence the scientific name which means "poison tree".