Looks like red mulberry to me.
I love mulberry. I'd pay money for it.
Most of what I have used has been from when people "top" fruitless white mulberry trees (which is a dumb thing to do) and stimulate the growth of long suckers inside the tree. When those things get about 4" and up dia., they have nice thick rings, but the heartwood has started to show well in the middle, and the wood is hard.
I treat it like high quality white wood, not osage, but I have never failed to make a bow from a decent stave. There is usually only a little heartwood on the belly, crown and knobs and lumps all down the back, but it heat treats well, handles strong draw weights, handles different designs, and holds together just fine.
I have noticed that some trunk wood I had was strangely not nearly as dense as old branch wood off the same tree, but it was still good.