How can you tell if you're dealing with poison oak or poison ivy? Both of these plants contain urushiol -- an oily compound ...

Poison oak rash is an allergic reaction to the leaves ... depending on the time of year. Like poison ivy and poison sumac, poison oak releases an oil called urushiol when it sustains damage.

Poison ivy, poison oak, and poison sumac are three plants notorious for causing itchy, uncomfortable rashes that can turn a pleasant outdoor experience into a nightmare. These plants contain ...

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When you’re spending time outdoors this summer, in your own yard or hiking in a park, it’s useful to know to spot poison ivy.