pacific poison oak
Toxicodendron diversilobum
Member of
poison ivies and oaks (genus Toxicodendron)
cashew family (family Anacardiaceae)
dicots (class Magnoliopsida)
cream, other colors in flowering plants
There are no other wild species of this genus in California.
Only primates are guinea pigs are known to be sensitive to the urushiol in poison oak. Guinea pigs are often used in lab experiments because they have similar allergic reactions as humans. [source]
Hosts poison ivy leaf gall mite (Aculops rhois).
Toxicity of western poison oak (Rhus diversiloba, Toxicodendron diversilobum):
1 – Skin contact with these plants can cause symptoms ranging from redness, itching, and rash to painful blisters like skin burns.
Chris’s observations: 116 (114 are research grade)
Locations:
- Edgewood Park & Natural Preserve: 17
- Santa Teresa CP: 8
- Calero CP: 7
- Henry Coe SP: 7
- Almaden Quicksilver CP: 6
- Coyote Lake / Harvey Bear Ranch CP: 5
- Fremont Older OSP: 5
- Monte Bello OSP: 4
- Sierra Azul; OSP: 4
- Stevens Creek CP: 4
- Joseph D. Grant CP: 3
- Mt. Madonna SP: 3
- Pleasanton Ridge RP: 3
- Alum Rock Park, San Jose: 2
- Coyote Hills RP: 2
- Coyote Valley OSP: 2
- Nisene Marks SP: 2
- Picchetti Ranch OSP: 2
- Sam McDonald CP: 2
- Sierra Vista OSP: 2
- Skyline Ridge OSP: 2
- Sunol Wilderness RP: 2
- Sweeney Ridge National Recreation Area: 2
- Bear Creek Redwoods OSP
- Coal Creek OSP
- Dimond Canyon Trail, Oakland
- Dry Creek Pioneer RP
- Ed R. Levin CP
- Golden Gate National Recreation Area
- Lexington Reservoir CP
- Los Trancos OSP
- Mt. Diablo SP
- Murray Ranch SP
- Pescadero Creek CP
- Pinnacles NP
- Point Lobos SP
- Russian Ridge OSP
- San Bruno Mountain State & County Park
- San Pedro Valley CP
- Sanborn CP
- Sibley Volcanic RP
- Waterdog Lake & Open Space
- Windy Hill OSP
Months:
- Feb.: 5
- Mar.: 17
- Apr.: 26
- May: 20
- Jun.: 9
- Jul.: 13
- Aug.: 5
- Sep.: 5
- Oct.: 6
- Nov.: 9
- Dec.: 1
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Not all sites include this taxon:
Bay Area species:
iNaturalist
–
Calflora
