All parts of the plant, including roots, can cause an allergic reaction year-round, according to the American Academy of Dermatology. Poison oak is commonly confused with poison ivy, but the two ...

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If you're outdoorsy, chances are you've encountered poisonous plants such as poison ivy, poison oak, or sumac. But what does ...

The poison oak plant looks like a leafy shrub and can grow ... depending on the time of year. Like poison ivy and poison sumac, poison oak releases an oil called urushiol when it sustains damage.