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Poison ivy, poison oak and poison sumac can make for an uncomfortable summer.
Greene (synonym Rhus rydbergii) – Western poison ivy is found in northern parts of the eastern United States. It also exists in the western United States and Canada but is much less common than poison oak. It may grow as a vine or a shrub. It was once considered a subspecies of poison ivy. It does sometimes hybridize with the climbing species.
Poison ivy is a type of allergenic plant in the genus Toxicodendron native to Asia and North America. Formerly considered a single species, Toxicodendron radicans , poison ivies are now generally treated as a complex of three separate species: T. radicans , T. rydbergii , and T. orientale .
Various mnemonic rhymes describe the characteristic appearance of poison ivy: [8] "Leaves of three, let it be" is the best known and most useful cautionary rhyme. It applies to poison oak, as well as to poison ivy. However, some other innocuous plants have similar leaves. [9] "Hairy vine, no friend of mine" [10]