Pretty good website, Mitch.
My first attempt at a traditional bow was years ago with ash. Made a beautiful lookin' bow, at least for a minute! Didn't survive the first shot.
Ash burns hot and fast. Rather have red oak.
The tree i.d. book is probably your best bet. Like others have said, keep it handy.
Maybe some of the older gents had an agri class like I did back in school. We had to identify the leaves, bark, fruit, and uses of at least forty trees that were native to Arkansas. I still remember most of the trees we tracked down. That was one of my favorite assignments of all, back in the day.
Stan