This is popping up in several places in my yard--weed or plant?
This has an eerie resemblance to osage orange, Maclura pomifera. Alternate foliage, shiny leaves. However, I have this same weed (tree, whatever) popping up in several of my beds here. I thought that it was osage orange. This plant is a common invasive here. But, if you research it says that 1) the wood is yellow and 2) the sap is milky. I know both of these traits to be true from OLDER specimens. After seeing your picture I cut off one of my identical volunteers. No milky sap and had greenish-tan wood. Perhaps it is too young to show the common traits, but sure the heck looks exactly like your post. Confused! Will be interested to see what others say.
I think you are right, it is Osage Orange and I looked it up on Daves Garden and sure looks the same. My neighbor thought it was some sort of tree. Guess I will let one of them grow for fun. I have no milky sap either. Strange, never had this before in my yard.