Article
Article
Poison ivy, poison oak, and poison sumac
Article By:
Karlik, John F. University of California Cooperative Extension, Bakersfield, California.
Last reviewed:May 2020
DOI:https://doi.org/10.1036/1097-8542.531307
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- Poison ivy, published January 2014:Download PDF
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- Poison sumac, published January 2014:Download PDF
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Commonly encountered plants that produce an oil called urushiol, which triggers allergic contact dermatitis in humans. Poison ivy (Fig. 1), poison oak (Fig. 2), and poison sumac (Fig. 3) are the best-known poisonous plants in North America, blamed for triggering approximately 350,000 cases of dermatitis in the United States annually. See also: Allergy; Poisonous plants
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