Poison ivy, oak, and sumac are found throughout the continental United States. Generally, poison ivy grows east of the Rocky Mountains, poison oak west of the Rocky Mountains, and poison sumac in the southeastern United States.
The appearance of the plants changes by geographical area and season. However, all of these plants have small white, tan, cream, or yellow berries in the autumn. Their berries can help distinguish them from harmless but similar plants.
After the leaves have fallen off, these plants can sometimes be identified by the black color on areas where the oil in the plant (urushiol) has been exposed to air.
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