Here’s a summary of How to Identify Poison Oak & What Makes It Different from Poison Ivy (PlantFAQ): Poison oak has leaves in clusters of three, but its leaflets are rounded and lobed—often looking like oak leaves—whereas poison ivy’s leaves are more pointed and smoother. PlantFAQ The plants differ in where they grow: western poison oak (Toxicodendron diversilobum) is found ma... https://plantfaq.com/how-to-identify-poison-oak-what-makes-it-different-from-poison-ivy/