Here's a link to the Native American Ethnobotany database. It's a little tricky to use but it has a ton of information. Plug in the name of the plant you are looking for and you'll get a ton of Native American uses. If you click on the link in the name it will take you to the USDA plant database for a picture of the plant. Pretty cool.
http://herb.umd.umich.edu/
There is also a book by the same name.
http://www.amazon.com/Native-America.../dp/0881924539
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