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Toxicodendron diversilobum (Torr. & A. Gray) Greene
Pacific poison oak, Western Poison Oak
Synonym(s): Rhus diversiloba, Toxicodendron radicans ssp. diversilobum
USDA Symbol: todi
USDA Native Status: L48 (N), CAN (N)
An erect or spreading shrub or a climbing vine with 3-parted leaves and brown or whitish berries. Western Poison Oak is not a true oak, but a close relative of Poison Ivy (Toxicodendron radicans). Poison Ivy also has 3-part compound leaves, but the leaflets are not lobed and have more slender, pointed tips. Poison Ivy replaces Poison Oak east of the Pacific Coast region. Poison Oak is so widespread and common in California that it almost qualifies as the state shrub. Anyone spending time in the lowlands and foothills of the state should learn to recognize the plant and avoid it at all costs. Livestock and deer commonly browse the plant without ill effect.
Plant CharacteristicsDuration: Perennial Habit: Shrub
, Vine Leaf Retention: Deciduous Leaf Arrangement: Alternate Leaf Complexity: Trifoliate Leaf Shape: Obovate
, Ovate Leaf Venation: Pinnate Leaf Margin:
Lobed Size Notes:
3-10 foot shrub
or climbing vine. Leaf:
Reddish-green early then green, brilliant red or yellow in fall. Fruit:
Bloom InformationBloom Color:
Yellow , Green Bloom Time:
Mar , Apr , May Bloom Notes: Flower
, WA Canada: BC Native Distribution:
Washington to Baja California, east to Arizona. Native Habitat:
Shady to open woods, streambanks, thickets in damp bottomlands.
BenefitWarning: All parts toxic.
Interesting Foliage: yes
National Wetland Indicator Status
|Status:|| FAC |
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2007-01-01
Research By: TWC Staff