Tony, the San Bernardino area was mostly known for citrus and predominately orange, lemon and grapefruit. In the early sixties I remember miles and miles of citrus trees along the back roads when the 91 was a two lane highway. Also if I remember right there was some walnut or pecan groves on the north end of town as you started to climb into the foot hills.
I would suggest taking a chunk to a local nursery and let them take a shot at it, otherwise I guess it’s a DNA test.![]()