The small, woody shrubs that are poison sumac are most common in the Eastern United States.
Also known as Rhus vernix or Toxicondendron vernix, poison sumac differs in appearance from the three-leaf clusters of poison ivy and oak.
Poison ivy, poison oak, and poison sumac are common culprits in cases of allergic contact dermatitis.
A reaction to resin produced by poison ivy, poison oak, or poison sumac is the most common source of symptoms.
There's nothing worse than doing yard work in the scalding sun only to find you've stumbled upon -- and rubbed your skin against -- poison ivy, poison oak, or poison sumac.