You may want to see about any Ag Department databases or native plant society databases. I haven't specifically found what I was looking for with food bearing trees, but I've seen what kinds of tree families grow in the area and then I've researched their food-bearing relatives.
All of the world's problems can be solved in a garden - Geoff Lawton. Tiny ad:
It's a bit like "run away to the circus" but with gardening
