As the name implies, poison ivy (Toxicodendron radicans) usually grows as an ivy. However, in Zion it occurs in its shrub state growing only a few feet tall in the wetter canyons of the park. Poison ivy can also be identified by the greyish-white fruit that is produced in the fall. Although it may appear harmless, beware of this plant as its oils can produce an allergic reaction in the form of an irritating rash. NPS Photo/Jonathan Fortner
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