Toxicodendron radicans

Toxicodendron radicans
	Poison ivy during autumn
	Poison ivy in spring, Ottawa, Ontario
Conservation status
	; Least Concern (IUCN 3.1)
	; Secure (NatureServe)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Sapindales
Family:	Anacardiaceae
Genus:	Toxicodendron
Species:	T. radicans
Binomial name
	Toxicodendron radicans; (L.) Kuntze
	Toxicodendron radicans range map in the United States and Canada
Synonyms
	Rhus radicans L.; Rhus verrucosa Scheele, syn of subsp. verrucosum;

Toxicodendron radicans, commonly known as eastern poison ivy^[3] or poison ivy, is an allergenic flowering plant that occurs in Asia and eastern North America. The species is well known for causing urushiol-induced contact dermatitis, an itchy, irritating, and sometimes painful rash, in most people who touch it. The rash is caused by urushiol, a clear liquid compound in the plant's sap.^[4] The species is variable in its appearance and habit, and despite its common name, it is not a true ivy (Hedera), but rather a member of the cashew and pistachio family (Anacardiaceae). T. radicans is commonly eaten by many animals and the seeds are consumed by birds,^[5] but poison ivy is most often thought of as an unwelcome weed. It is a different species from western poison ivy, T. rydbergii, which has similar effects.

^ Bárrios, S. & Copeland, A. (2021). "Toxicodendron radicans". IUCN Red List of Threatened Species. 2021: e.T124270453A192137361. doi:10.2305/IUCN.UK.2021-3.RLTS.T124270453A192137361.en. Retrieved 26 September 2023.
^ NatureServe (1 September 2023). "Toxicodendron radicans". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 26 September 2023.
^ USDA, NRCS (n.d.). "Toxicodendron radicans". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 11 December 2015.
^ Barceloux, Donald G. (2008). Medical Toxicology of Natural Substances: Foods, Fungi, Medicinal Herbs, Plants, and Venomous Animals. John Wiley and Sons. pp. 681–. ISBN 978-0-471-72761-3.
^ Department of Biology Hamilton College Ernest H. Williams Jr. Professor (26 April 2005). The Nature Handbook: A Guide to Observing the Great Outdoors: A Guide to Observing the Great Outdoors. Oxford University Press. pp. 57–. ISBN 978-0-19-972075-0.

[iucnredlist-1] Bárrios, S. & Copeland, A. (2021). "Toxicodendron radicans". IUCN Red List of Threatened Species. 2021: e.T124270453A192137361. doi:10.2305/IUCN.UK.2021-3.RLTS.T124270453A192137361.en. Retrieved 26 September 2023.

[2] NatureServe (1 September 2023). "Toxicodendron radicans". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 26 September 2023.

[3] USDA, NRCS (n.d.). "Toxicodendron radicans". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 11 December 2015.

[Barceloux2008-4] Barceloux, Donald G. (2008). Medical Toxicology of Natural Substances: Foods, Fungi, Medicinal Herbs, Plants, and Venomous Animals. John Wiley and Sons. pp. 681–. ISBN 978-0-471-72761-3.

[Professor2005-5] Department of Biology Hamilton College Ernest H. Williams Jr. Professor (26 April 2005). The Nature Handbook: A Guide to Observing the Great Outdoors: A Guide to Observing the Great Outdoors. Oxford University Press. pp. 57–. ISBN 978-0-19-972075-0.

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