Toxicodendron diversilobum

Poison-oak is a suckering deciduous shrub that can become a vine if given something to climb onto. Poison oak uses aerial roots to sucker and to latch onto trees or walls. We do not grow it as we've not figured out how to deal with itchy lawsuits. The oils in the plant tissues cause a nasty rash. Washing the areas of skin that contacted it with a mild detergent and warm water can greatly reduce the problem for most of us. In the top five for wildlife, but very flammable, so do not plant next to house. (syn. Rhus diversiloba)