Best wildflower book out there...
http://www.amazon.com/Newcombs-Wildflower-Guide-Lawrence-Newcomb/dp/0316604429/ref=sr_1_1?ie=UTF8&qid=1332213440&sr=8-1
Here are a few I use. They are geared towards the southeast mainly but we have a lot of the same stuff.
http://www.wildflower.org/plants/
http://www.namethatplant.net/index.shtml
http://www.goldendelighthoney.com/tes/endangered_flora.html
http://www.duke.edu/~cwcook/trees/
Happy Spring!
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