Newcomb's is best suited for east of the Rockies it's true, but there are overlapping species as well as weedy species with a distribution throughout nearly all the contiguous states. If you can get a copy for a quarter then it's always good to keep in your arsenal. Audubon has field guides for just about everything and usually a western/eastern and sometimes more regional than that. I have not used much other than their eastern tree guide (fine, but lacking in taxonomic knowledge) and their wildflower, tree, and bird apps.
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