Calflora, a 501c3 non-profit
Distribution by County   8015    
Toxicodendron diversilobum  (Torr. & A. Gray) Greene
Poison oak,   Poisonoak,   Western Poison Oak
Toxicodendron diversilobum is a vine or shrub that is native to California, and also found elsewhere in western North America.
Record Count by County

Alameda: 141 Los Angeles: 1045 Sacramento: 210 Siskiyou: 12
Amador: 96 Madera: 113 San Benito: 296 Solano: 52
Butte: 459 Marin: 1418 San Bernardino: 53 Sonoma: 628
Calaveras: 152 Mariposa: 267 San Diego: 610 Stanislaus: 21
Colusa: 60 Mendocino: 128 San Francisco: 204 Sutter: 44
Contra Costa: 151 Merced: 9 San Joaquin: 9 Tehama: 357
Del Norte: 10 Monterey: 322 San Luis Obispo: 243 Trinity: 78
El Dorado: 238 Napa: 144 San Mateo: 796 Tulare: 386
Fresno: 213 Nevada: 158 Santa Barbara: 196 Tuolumne: 271
Glenn: 36 Orange: 398 Santa Clara: 393 Ventura: 471
Humboldt: 112 Placer: 114 Santa Cruz: 325 Yolo: 52
Kern: 97 Plumas: 23 Shasta: 89 Yuba: 154
Lake: 74 Riverside: 235 Sierra: 19

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 11/21/2024).