SoCal, wood/tree identification is difficult enough when you have a piece of it in your hands. But trying to id it from a photo on the net, well, that's even tougher. For you (and everyone else), the best way is to look at (photograph) the twigs, leaves, and flowers/fruits (nuts or whatever). That's where the easily identifiable characteristics are. Bark and or wood can vary greatly, depending on where the trees grow, altitude, climate, soils, rainfall, the list of variables goes on and on.
I'm a retired botanist/forester in North Carolina and have spent most of my career identifying trees and other plants. I'm familiar with the vegetation here, but southern California might as well be central Australia as far as I know about the trees that grow there. The LA area was historically devoid of trees before settlement. I'd bet that 90% or more of the trees there now are non-native ornamentals. And because of the forgiving climate and the addition of irrigation, it's a good bet that a lot of trees there are from all over the world.:confused: