Answer: It's really difficult to identify a tree without seeing it. By the shape of the leaves, it doesn't sound like a Chinese pistachio. More like an oak or an aspen. You didn't mention whether it was evergreen or deciduous and whether or not it flowers or bears fruit. These points are important in terms of identification. You can submit another question with more detail, or ask someone in Fresno to take a few leaves into a nursery for identification. Best wishes with your garden!
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