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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.
Some species formerly recognized in Rhus, such as poison ivy (Toxicodendron radicans, syn. Rhus toxicodendron), poison oak (Toxicodendron diversilobum, syn. Rhus diversiloba), and poison sumac (Toxicodendron vernix, syn. Rhus vernix), produce the allergen urushiol and can cause severe delayed
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]
Berries in winter, Wasatch Range 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).
Toxicodendron rydbergii: western poison ivy Anacardiaceae (cashew family) Toxicodendron radicans: eastern poison ivy Anacardiaceae (cashew family) Toxicodendron pubescens: Atlantic poison oak Anacardiaceae (cashew family) Toxicodendron parviflorum: small-flowered poison sumac Anacardiaceae (cashew family) Toxicodendron diversilobum: Pacific ...
The berries are generally considered most toxic to humans, causing nausea, vomiting, abdominal pain, and diarrhea. [141] Ingestion of even just a few berries may be sufficient to cause gastrointestinal upset in children, the primary culprit being the saponins; stupor and drowsiness are sometimes seen in children who ingest very large quantities ...