The plant may have yellow or green flowers or yellow-green berries, depending on the time of year. Like poison ivy and poison sumac, poison oak releases an oil called urushiol when it sustains damage.

Poison sumac (Toxicodendron vernix) is a highly toxic plant species native to eastern North America. It's related to poison ivy and poison oak and notorious for causing severe allergic reactions ...

The University of Massachusetts Extension Weed Herbarium offers pictures of various parts of the poison ivy plant to help identify it. What Poison Oak and Poison Sumac Look Like Poison oak and ...