Previous names are Rhus diversiloba (Pacific poison-oak) and Rhus radicans (western poison-ivy). The current scientific names are Toxicodendron diversilobum for Pacific poison-oak and T. Pacific poison-oak and western poison-ivy are in the sumac ( Anacardiaceae) family. These two plants can substantially limit the use and enjoyment of our natural environment. Many people are immune when young but suddenly or gradually become sensitive with age, possibly due to sensitization through repeated exposure.
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Individual reactions vary from extreme susceptibility to near immunity.
Idaho leaf guide with pictures skin#
All parts of Pacific poison-oak and western poison-ivy plants (except the pollen) contain an oily substance, urushiol (pronounced: you-ROO-shee-all), that is present throughout the entire year.Įxposure to urushiol can cause an allergic contact dermatitis reaction that includes painful irritation and blistering of the skin and, if inhaled in smoke, the lungs. Outdoor recreationists, land managers, forest and conservation workers, and wildland firefighters are most frequently exposed to these plants. Both plants are native to the Pacific Northwest.
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Pacific poison-oak and western poison-ivy often grow in fencerows, waste areas, evergreen forests, woodland savannahs, hill pastures, clear-cut forests, stream banks, wetlands, and rocky canyons. These plants are so similar in their appearance, growth, effects on humans, and responses to control efforts that their common names are often interchanged. Its near relative, western poison-ivy, is found in eastern Oregon and Washington, throughout Idaho, and eastward. Pacific poison-oak is common in western Oregon and Washington.