Monrovia Canyon Park - Western Poison Oak

"Leaves of three, let it be. It's no joke it's poison oak!"

(Toxicodendron diversilobum)

Springtime patch of Poison Oak in its "green phase" showing the classic three "leaflets" that make up the actual plant leaf. This plant is not an Oak but is in the Sumac family. It gets its name from its lobed leaflets that resemble the leaves of Old World oak trees. Click here for view of this plant from later in the year.
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Poison Oak, Click for detailed Info

 

Poison Oak in its "red phase" that occurs in late summer, early fall, again showing the classic three "leaflets" that make up the actual plant leaf.
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Poison Oak, Click for detailed Info