Calflora: Toxicodendron diversilobum

Toxicodendron diversilobum (Torrey & A. Gray) E. Greene

Pacific poison oak, Poisonoak, poison, poison oak

Toxicodendron diversilobum, a dicot, is a vine or shrub that is native to California and is also found outside of California, but is confined to western North America.

Communities:	Yellow Pine Forest, Foothill Woodland, Chaparral, Valley Grassland, (many plant communities)
Habitat:	slopes [Walker]
Toxicity:	DERMATITIS [California Poison Control System 2010]
Elevation:	between 0 and 5000 feet

Family:	Anacardiaceae (TJM2 Treatment)

Name Status:

Recognized as current in TJM2 + PLANTS + JM93

Synonyms:

PLANTS:	Rhus diversiloba
PLANTS:	Toxicodendron radicans ssp. diversilobum

Distribution in California by County:

See a detailed Distribution Grid of this plant in California.

A shaded county indicates that there are one or more ocurrence records of this plant within the county.

Hover the mouse over the map to see county names. Click to view records from that county.

	There are specimen records from this county in an herbarium.
	There are documented records, vouchered or confirmed by an expert.
	There are reported records.
	There are reported records available indirectly (eg. in botanical literature).

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Observations with Photos

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Records by County, with approximate record counts in the form: TOTAL / CCH. Click county name to view records.

Alameda: 26 / 10 CCH Amador: 3 / 1 CCH Butte: 34 / 22 CCH Calaveras: 3 / 2 CCH Contra Costa: 22 / 11 CCH Colusa: 6 / 1 CCH Del Norte: 12 / 7 CCH El Dorado: 28 / 0 CCH Fresno: 10 / 2 CCH Glenn: 6 / 0 CCH Humboldt: 36 / 22 CCH Kern: 7 / 2 CCH Lake: 12 / 5 CCH Los Angeles: 120 / 72 CCH Madera: 1 / 0 CCH Mendocino: 37 / 5 CCH Monterey: 70 / 15 CCH Mariposa: 9 / 3 CCH Marin: 68 / 4 CCH Napa: 34 / 16 CCH Nevada: 8 / 1 CCH Orange: 24 / 7 CCH Placer: 9 / 5 CCH Plumas: 1 / 0 CCH Riverside: 45 / 22 CCH Sacramento: 19 / 5 CCH Santa Barbara: 54 / 30 CCH San Bernardino: 16 / 14 CCH San Benito: 14 / 3 CCH Santa Clara: 23 / 14 CCH Santa Cruz: 26 / 12 CCH San Diego: 127 / 105 CCH San Francisco: 134 / 4 CCH Shasta: 10 / 2 CCH Sierra: 1 / 0 CCH Siskiyou: 6 / 4 CCH San Joaquin: 1 / 1 CCH San Luis Obispo: 91 / 3 CCH San Mateo: 27 / 3 CCH Solano: 11 / 4 CCH Sonoma: 50 / 4 CCH Stanislaus: 2 / 1 CCH Sutter: 3 / 2 CCH Tehama: 10 / 2 CCH Trinity: 18 / 5 CCH Tulare: 14 / 7 CCH Tuolumne: 6 / 3 CCH Ventura: 44 / 9 CCH Yolo: 4 / 2 CCH

CCH: records provided by the participants of the Consortium of California Herbaria.

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Information about Toxicodendron diversilobum from other sources:

Photos on CalPhotos / Picasa / Flickr
Photos or website references on Google
USDA PLANTS Profile (TODI)
Nursery availability and horticultural info (what grows with this plant?) on CNPLX
UC Integrated Pest Management Weed Photo Gallery
(profile of this plant as an agricultural weed)
2011 Jepson Manual Treament from the Jepson Herbarium,
University of California, Berkeley
Original Publication citation. on the International Plants Names Index
Search efloras.org (Flora of North America)