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.
Reproduced with permission from: Bolognia J, Jorizzo JJ, Rapini RP, et al. Dermatology. Elsevier, Boston 2003. Copyright © 2003 Elsevier.
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