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Uptodate Reference Title
Identification of poison ivy, oak, and sumac
Identification of poison ivy, oak, and sumac
Characteristic features useful for identifying poison ivy, poison oak, and poison sumac. Poison ivy and poison oak are often identified by 3 leaflets with flowering branches arising from axillary positions on a single stem. Poison sumac more often forms leaflets of 5, 7, or more that angle upward toward the top of the stem.