Toxicodendron diversilobum

Toxicodendron diversilobum

Leaves of Toxicodendron diversilobum

Foliage at Samuel P. Taylor State Park

Toxicodendron diversilobum, commonly known as Pacific poison oak, is a plant native to western North America. It is a member of the Anacardiaceae family and is known for causing contact dermatitis in humans.

Description

Toxicodendron diversilobum is a deciduous shrub or vine that can grow up to 3 meters tall as a shrub and up to 30 meters long as a vine. The leaves are typically divided into three leaflets, which can vary in size and shape. The plant is known for its ability to change color with the seasons, displaying green leaves in spring and summer, and vibrant red or orange hues in the fall.

Habitat

Contact dermatitis caused by Toxicodendron diversilobum

Toxicodendron diversilobum is found in a variety of habitats, including woodlands, grasslands, and chaparral. It thrives in areas with well-drained soil and can often be found along trails and roadsides. The plant is widespread in California and extends into Oregon, Washington, and British Columbia.

Toxicity

The plant contains an oil called urushiol, which is responsible for the allergic reaction known as contact dermatitis. Urushiol can cause itching, redness, and blistering of the skin upon contact. The severity of the reaction can vary depending on individual sensitivity and the amount of exposure.

Ecological Role

Toxicodendron diversilobum in its red phase

Despite its reputation as a nuisance to humans, Toxicodendron diversilobum plays an important role in its ecosystem. It provides food and habitat for various wildlife species. Birds and small mammals consume the berries, while deer and other herbivores browse the leaves.

Management

Controlling Toxicodendron diversilobum can be challenging due to its vigorous growth and ability to resprout from roots. Mechanical removal, such as cutting or mowing, can be effective but may require repeated efforts. Chemical herbicides can also be used, but care must be taken to avoid harming non-target plants.

Gallery

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  Toxicodendron diversilobum flowering
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  Berries of Toxicodendron diversilobum
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  Pacific poison oak
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  Smaller leaves of Toxicodendron diversilobum
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  Climbing form of Toxicodendron diversilobum

Related pages

• Toxicodendron radicans
• Toxicodendron vernix
• Contact dermatitis

Toxicodendron diversilobum

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  Toxicodendron diversilobum
• 
  Foliage at Samuel P. Taylor State Park
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  Poison ivy contact dermatitis
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  Red phase of Toxicodendron diversilobum
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  Flowering Toxicodendron diversilobum
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  Berries of Toxicodendron diversilobum
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  Pacific Poison Oak
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  Toxicodendron diversilobum
• 
  Climbing form of Toxicodendron diversilobum