Hi David,
Your best hope is to wait for the peaches to mature. That at least will tell you if it
has certain characteristics, like red/yellow flesh, freestone, etc. I think trying to identify it
by it's trunk or leaves would be much more difficult. No books come to mind with illustrations.
You may try checking the libraries at the Chicago Botanic
Garden or Morton Arboretum, who may have such books.

Sherwin D.

David Efflandt wrote:

I purchased a home in the Chicago suburbs and have a tree that appears to
be a peach, but am trying to identify what kind. Currently in early May
it has slender red leaves and little red flowers with pink hairy things.
The reddish yellow fruit has been small enough the past 2 summers that I
almost thought it was an apricot, but that apparently has a different leaf
shape and I think requires a warmer climate. I have pruned it, but maybe
need to thin out the forming fruit for remaining fruit to get larger.

It certainly seems to grow well in this area, there were many sprouts this
year from dropped fruit pits. Since the existing tree is too close to a
fence, I transplanted the best 2 year old sprout to a better location with
more space around it. Time will tell if I did that right.

Does anyone know of a good web site to help identify type of peach?