E-Flora BC: Electronic Atlas of the Flora of British Columbia

Toxicodendron diversilobum (Torr. & A. Gray) Greene
poison oak (Pacific poison oak)
Anacardiaceae (Sumac family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #11274)

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Distribution of Toxicodendron diversilobum
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Species Information

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General:
Deciduous shrub 1-2 m tall or woody climbing vine up to 15 m tall, glabrous to hairy, exuding milky juice when cut.
Leaves:
Leaflets 3-5, rounded, obtuse or sometimes sharp-pointed at the tips, 3-7 cm long, turning scarlet in autumn.
Flowers:
Inflorescence in loose, axillary, often reflexed panicles; flowers bisexual or unisexual, 1-2 mm long, yellowish-green; stamens exserted.
Fruits:
Berrylike drupes, 5 mm long, white, glabrous.
Notes:
Many people develop an itching or burning rash after contacting this plant because of its slightly volatile oil.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry to mesic rocky slopes (often climbing trees) in the lowland zone; rare in SW BC, known from SE Vancouver Island, the Gulf Islands and Howe Sound; S to MX.

Source: The Illustrated Flora of British Columbia

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Rhus diversiloba Torr. & A. Gray
Toxicodendron radicans subsp. diversilobum (Torr. & A. Gray) Thorne

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References