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Toxicodendron radicans, commonly known as eastern poison ivy [3] or poison ivy, is a species of allergenic flowering plant. It has numerous subtaxons and forms both vines and shrubs. Despite its common name, it is not a true ivy, but rather a member of the cashew and pistachio family Anacardiaceae.
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.
Toxicodendron is a genus of flowering plants in the sumac family, Anacardiaceae. It contains trees , shrubs and woody vines , including poison ivy , poison oak , and the lacquer tree . All members of the genus produce the skin-irritating oil urushiol , which can cause a severe allergic reaction.
Urushiol-induced contact dermatitis (also called Toxicodendron dermatitis or Rhus dermatitis) is a type of allergic contact dermatitis caused by the oil urushiol found in various plants, most notably sumac family species of the genus Toxicodendron: poison ivy, poison oak, poison sumac, and the Chinese lacquer tree. [1]
Toxicodendron succedaneum: Japanese Hazenoki tree Anacardiaceae (cashew family) Toxicodendron striatum: manzanillo Anacardiaceae (cashew family) Toxicodendron rydbergii: western poison ivy Anacardiaceae (cashew family) Toxicodendron radicans: eastern poison ivy Anacardiaceae (cashew family) Toxicodendron pubescens: Atlantic poison oak
Unlike Toxicodendron radicans (eastern poison ivy), which often appears as a trailing or climbing vine, T. rydbergii is a shrub that can grow to 1 m (3 ft) tall, rarely up to 3 m (10 ft). The leaves are trifoliate and alternate. The leaflets are variable in size and shape, and are usually 15 cm (6 in) long, turning yellow or orange in autumn.
Toxicodendron diversilobum (syn. Rhus diversiloba), commonly named Pacific poison oak [1] or western poison oak, is a woody vine or shrub in the sumac family, Anacardiaceae. It is widely distributed in western North America, inhabiting conifer and mixed broadleaf forests , woodlands, grasslands, and chaparral biomes. [ 2 ]
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