the most common plants in the United States that is poisonous to touch, causing a contact dermatitis in most people. The leaves of the poison ivy plant are glossy green, may be notched or smooth, and almost always grow in groups of three. However, according to some experts, there are exceptions; leaves may sometimes appear in fives, sevens, or even nines. in early fall, the leaves may turn bright red. Although it usually grows as a long, hairy vine (often wrapping itself around trees), it also can be found as a low shrub growing along fences or stone walls. Poison ivy has waxy yellow-green flowers and green berries that can help identify the plant in late fall, winter, and spring, before the leaves appear. Poison ivy is found throughout the United States, but it is most common in the eastern and central states.
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