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poison ivy, markweed, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans | climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact ❲Toxicodendron radicans, Rhus radicans❳ |