I'd like to start identifying trees in my area as a project with my kids while we are hiking.
What is best for tree identification? Is it a good color book such as the Audubon Field Guide to North American trees, which they have for the Eastern Region, and the Western Region? Is there a good tree identification app for smartphones, or some third option I'm not aware of?
I know tree identification is often complex as leaves can be similar, and usually require a combination of factors (bark, leaves, etc). I'd like a resource where I look up a tree based on its leaf and bark features, not its name, so that I can avoid spending hours flipping through pages.