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Poison oak (Toxicodendron diversilobum ) is a noxious plant found along the west coast of the United States and in areas of southwestern British Columbia. In California it is so prevalent that it is considered the most hazardous plant in the state and working days lost there to poison oak dermatitis have a significant economic impact.
Poison oak is a deciduous plant with a woody stalk which takes one of two forms depending on whether it is growing by itself in the open or is sheltered by trees or structures. In the open, it appears as a bushy shrub which can reach a maximum of 6 feet (2 metres) in height. In sheltered areas, it is more
vinelike supporting itself by clinging to nearby trees, fences or structures and growing much taller.
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