stix it looks like white or paper birch as Dakota Kid said, but to make sure, what state are you in?
I'm curious to see how white birch works out as a bow. I don't have enough of it surviving on my land after some kind of insect or disease attack for me to want to cut any. As Dakota said most of the bows I've made are black birch, and I'm very happy with how they have turned out.
I have yet to try yellow birch but I will this summer. In terms of rating the birches as bow woods, I can't prove it myself yet, not having tried them all, but just looking at the wood specs I'd guess yellow might be a small amount better than black, and white a little lower in the list. But you never really know unless you try them. Black is the heaviest and stiffest, then yellow, and then white.
Black is by far the straightest and most limbless tree growing here. It looks like natural telephone poles here. It's easy to cut clear wood from it. Yellow tends to have branches all down the trunk, to divide, and to grow twisty. It's hard to imagine doing anything but character bows with the quality trees i see here. White might be better I think, but again, I don't have enough to say.
I say go for it -- pick a straight tree, thick as possible (they look small in the pic) and without too many limb scars, and i bet it makes a decent bow.
