Leaflets three, let it be!
Poison oak is often seen in shady patches along California trails, with the vine growing into the sunlight to catch unwary hikers. The leaves, stems and branches all carry the oil that is poisonous. Hypersensitive people can develop rashes just by being near the plant, though most have to touch it to develop the rash.
These photographs were taken at the Pinnacles National Park, near Paicines, CA. Note the “real” oak leaves on the ground providing mulch for these poison oak plants.
