As seen in my photos, poison oak can look different. It can grow like a ground cover, large shrub, a tree or a climbing vine. As said the Leaves of three, let it be. That part is true. But said the leaves are glossy. I have see them dull and also sickly. They are also have scalloped, toothed, or lobed edges. They start out a reddish green leaves to a bright green then turn red and black before it dies back. Before it does it has bunch of seeds that almost resembles small yellowish berries. Sometimes they can be mistaken for young oak trees or blackberry. And many times the Poison Oak to be growing with them. The toxin oil, urushiol can be on the leaves and stem and even during their dormant state, bare twigs.
Can be found in shaded to partially shaded to full sun. In woodlands, among other shrubs, and damp areas.
Found in Point Pinole but can be found throughout California