Answer: Without actually seeing the tree, I'm only venturing an educated guess - I think it's holly oak (Quercus ilex). This is an evergreen tree with a dense, rounded canopy; leaves are usually oval to lance shaped, 1-3" long; bark is smooth and white when young, changing to a gray-white with maturity.
If this description doesn't fit the tree, try taking a sample of the foliage and a snapshot of the tree to your local Cooperative Extension office. Folks there are familiar with your local flora and can probably identify it for you. (Phone 805-781-4316)
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