Canyon Oak is the most widely distributed Evergreen Oaks in the state  from Oregon to Baja. The grow in large open vase-like patterns  with acorns that are chestnut brown in color  and leaves that are dark green with spiny lobes and a flat structure. Galls form by beneficial wasps egg placement on branches. Largest Oak is 72 feet in height  10 feet in diameter  in Palomar Mountain State Park. Can take the form of a low growing shrub  or enormous tree  depending on the soil qualities.