Probably American Plum, based on the size. Oklahoma has Sand Plum, Oklahoma Plum, Chickisaw Plum and many others, which are smaller plum trees. Does it have thorns/modified branches, and is it suckering?
Have not noticed thorns. I really haven't really looked them over good, I need to clear out around them and get a better look. The leaves are a bit more oblong than the pics of Chickasaw plum I've seen.
Thanks Brush, I'll get some better details.
