Native American Ethnobotany Database A Database of foods, drugs, dyes
and fibers of Native American Peoples that are derived from plants. Each entry contains how the item is used, a reference to the literature, and for most entries a link to the USDA Plants datbase.
USDA Plants Database The PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories. It includes names, plant symbols, checklists, distributional data, species abstracts, characteristics, images, crop information, automated tools, onward Web links, and references.
Edgar J. DaSilva/ EJB Electronic Journal of Biotechnology Vol.2 No.2, Issue of August 15, 1999. Old article, but you can use it for the references. There are 86 cited references in Google Scholar: http://scholar.google.com/scholar?hl=en&lr=&cites=5092067232785491689&um=1&ie=UTF-8&ei=aJwoToqjMoaksQPPt6TeCA&sa=X&oi=science_links&ct=sl-citedby&resnum=1&ved=0CBkQzgIwAA