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'''Poison oak''' refers to two plant species in the genus ''[[Toxicodendron]],'' both of which can cause skin irritation:
{{Unreferenced|date=March 2013}}
'''Poison oak''' is a [[deciduous]] shrub native to [[North America]]. Its leaves contain a compound that causes a [[rash]] on human skin. ''Poison oak'' can specifically refer to:


* ''[[Toxicodendron diversilobum]]'', which grows in Western Coast of North America
*''[[Toxicodendron diversilobum]]'' or Pacific poison oak, found in western North America
* ''[[Toxicodendron pubescens]]'', which grows in Eastern North America
*''[[Toxicodendron pubescens]]'' or Atlantic poison oak, found in southeastern North America


{{plant common name}}
Poison oak (Toxicodendron diversilobum) and its eastern counterpart [[poison ivy]] (T. radicans) are two of the North American plants most painful to humans. Note: These species were formerly placed in the genus ''[[Rhus]]''. Poison oak and a related, look-alike shrub, ''Rhus trilobata'' belong to the ''[[sumac]]'' family (''Anacardiaceae'').

Poison oak is widespread throughout the mountains and valleys of [[California]]. It thrives in shady canyons and riparian habitats. It commonly grows as a climbing vine with aerial (adventitious) roots that adhere to the trunks of [[oak]]s and [[platanus|sycamores]].

Rocky Mountain poison oak (Toxicodendron rydbergii) occurs in canyons throughout the western [[United States]] and [[Canada]]. Because the two species of western poison oak look like a [[vine]] as they develop, some authors list poison oak as a subspecies of eastern poison ivy.
Poison oak often grows like a climbing vine.

[[Category:Toxicodendron]]


{{Anacardiaceae-stub}}

Latest revision as of 10:43, 16 October 2023

Poison oak refers to two plant species in the genus Toxicodendron, both of which can cause skin irritation: