Search for native plants by scientific name, common name or family. If you are not sure what you are looking for, try the Combination Search or our Recommended Species lists.
Search native plant database:
Toxicodendron diversilobum (Torr. & Gray) Greene
Pacific poison oak, Western Poison Oak
USDA Symbol: todi
USDA Native Status: Native to U.S.
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 inconspicuous.
CA , NV , OR , WA Canada: BC Native Distribution:
Washington to Baja California, east to Arizona. Native Habitat:
Shady to open woods, streambanks, thickets in damp bottomlands. USDA Native Status: L48(N), CAN(N)
BenefitWarning: All parts toxic.
Interesting Foliage: yes
Recommended Species Lists
Find native plant species by state. Each list contains commercially available species suitable for gardens and planned landscapes. Once you have selected a collection, you can browse the collection or search within it using the combination search.
View Recommended Species page
Record Modified: 2007-01-01
Research By: TWC Staff