DLH
I have used boards exactlly like the one pictured. It appears to be biased grain orientation and will make a really good bow. However you will be well served to back it. I make all my self bows from fully quartersawn (edge grain) and put 1/8" wooden backers on the biased grain. White ash makes very nice performing bows and to be honest, elm backed white ash is one of my personal favorites. Ash also makes very excellent backers too. This is just one guy's opinion though, but I like it.
rich