Quercus douglasii | Stanford Dish
Blue Oak (Quercus douglasii) is one of the most beloved of all California native oaks. Their primary range is known as a “bath tub stain” around the Great Central Valley of California. These hot, arid foothill regions provide ideal conditions for the very drought adapted Blue Oak. But Blue Oaks occur in some other parts of the state, including the Foothills above Stanford University, on the Peninsula of the San Francisco Bay. There are even a few remnant trees on the Stanford campus itself. They are known for their symmetrical canopies, and bluish foliage.