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

Poison ivy typically has three shiny green leaves (or red in the fall) budding from one small stem. Poison oak also typically comes in leaves of three. What to do if you’re exposed to poison ...

Poison oak rash is an allergic reaction to the leaves or stems of the western poison ... depending on the time of year. Like poison ivy and poison sumac, poison oak releases an oil called urushiol ...