poison oak
poison oak
Species of poison ivy (Toxicodendron diversilobum) native to western North America and classified in the sumac (or cashew) family. Like many other lobe-leafed plants commonly called oak, poison oak is not an oak tree (genus Quercus).
This entry comes from Encyclopædia Britannica Concise.
For the full entry on poison oak, visit Britannica.com.
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