UPDATE!!!
After consultation with the local Forestry service office and a local cabinet maker, the best guess is Yellow Birch, probably heartwood. the bow is coming along nicely and will have more updates for it in my other thread "pleaase check my longstring tiller."
Ok. Digging around today looking for some 2*10" to make a caul for another bow, and found a piece of timber 2"*10" and about 7' long. Is very heavy and straight. First thought was I could use it as the caul. Second thought was I could make a bow out of it. Took it to the workshop and cut a 2"*2" piece. As you can see from the photos it is nearly quarter sawn and I was thinking of having the grain run vertical through the bow. Is this a problem, I don't think it should be as the grain runs straight the length of the stave.
I also do not know what type of wood it is. It is from a rough cut board that has been sitting around in the barn for years. Very dry and out of the weather. Little punky on one end but cut that out and wood seems very solid. Thought it might be Cherry but no deep coloring of the board. It has been in the dark attic of the barn for most of its time but even that should have caused some darkening.
Also any thoughts on design for a bow out of this wood, would be appreciated.