Poison ivy (Toxicodendron radicans) is a vine that contains an oily resin known as urushiol. According to the Centers for ...

Poison ivy, poison oak, and poison sumac are three ... These plants contain urushiol, a potent oil that causes allergic reactions in about 85% of people who come into contact with it.

Like poison ivy and poison sumac ... Direct contact with the oil from poison oak is the cause of allergic reactions. This may be from touching the plant itself or from touching materials that ...

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.

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