No, it's non-native, and listed by FL Exotic Pest Plant Council as a Cat 1 invasive. Though, the one pictured is only the 2nd one I've ever seen in this area and the only one (I've seen) growing in the wild.
The other is an absolute monster of a tree that was hit by lightning years ago and is still a monster of a tree. I'll try to get a pic or two.
Yes, the leaves are trifoliate and serrate. Roots like to be on the surface. If I get pics of the other tree, that aspect will stick out.
Good Luck!