The name Poison oak refers to various species of the genus Toxicodendron that grow in North America:

• Western Poison-oak (Toxicodendron diversilobum or Rhus diversiloba), found only on the Pacific Coast of North America, ranging from southern Canada to Baja California
• Atlantic Poison-oak (Toxicodendron pubescens or Rhus toxicarium), which grows mostly in sandy soils in eastern parts of the United States

Toxicodendron is a genus of woody Trees Shrubs and Vines in the Anacardiaceae or Sumac Family including poison ivy poison oak Toxicodendron diversilobum (syn Rhus diversiloba; Western Poison-oak or Pacific Poison-oak) is a plant best known for its ability to cause Toxicodendron pubescens (syn Rhus pubescens; Atlantic Poison-oak) is an erect Shrub that can grow to 1 m (3 ft tall

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