0 a North American plant similar to poison ivy, that causes your skin to itch and turn red if you touch it:
Contact with substances like poison oak can easily cause a blistering allergic skin reaction.
If you're allergic to giant hogweed sap, it can be nastier than poison ivy or poison oak.
Many of the firefighters had rashes from the poison oak that blankets the area.
She lectures to local garden clubs about poison oaks, sumacs, and ivies.
In these oak woodlands, the dominant understory plants are toyon, blackberry, western poison-oak and in occasional drier patches some coyote brush.
It is considered effective at treating the pain of minor burns, poison ivy, poison oak, itching, minor skin wounds or insect bites.
Be wary of poison oak.
Poison oak is evident in the area.
