Page author: David Giblin
Toxicodendron diversilobum
Pacific poison-oak
WTU specimens
Other herbaria

Distribution: Mainly west of the Cascades in Washington; British Columbia south to California, east to Nevada.

Habitat: Open woods at low elevations.

Flowers: April-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Glabrous to pubescent shrubs or climbing vines 1-15 m. tall.

Leaves:

Leaves trifoliate; leaflets ovate to obovate, sinuate to deeply lobed, rounded to acute, 3-7 cm. long.

Flowers:

Inflorescence of loose, axillary panicles; flowers mostly imperfect, dioecious, 1-2 mm. long; calyx 5-parted, pubescent to glabrous, about half the length of the petals; petals 5, spreading; staminate flowers with 5 exerted stamens, the filaments attached to the rim of a fleshy, flat disk; ovary superior, style 1, stigmas 3.

Fruits:

Fruit drupe-like, globose, glabrous, about 5 mm. long.

Accepted Name:
Toxicodendron diversilobum (Torr. & A. Gray) Greene
Publication: Leafl. Bot. Observ. Crit. 1(9): 119. 1905.

Synonyms & Misapplications:
Rhus diversiloba Torr. & A. Gray [HC]
Toxicodendron radicans (L.) Kuntze ssp. diversilobum (Torr. & A. Gray) Thorne
Additional Resources:

PNW Herbaria: Specimen records of Toxicodendron diversilobum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Toxicodendron diversilobum checklist entry.

E-Flora BC: Toxicodendron diversilobum atlas page.

CalPhotos: Toxicodendron diversilobum photos.

USDA Plants: Toxicodendron diversilobum information.

32 photographs:
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