Algy's Herb Page Many resources related to medicinal herbs. The database is much more than the usual botanical search engine out there on the Web, which allows you to search by the uses for a plant. American Indian Ethnobotany Database Foods, Drugs, Dyes, and Fibers of Native North American Peoples. The Ethnobotany Cafe Discussion of plants, their uses, and how they relate to cultures. Links to many other sites.
Data sources are the same oldish reports.
But the additional AGIS ethnobotany databases make the combined, cross-referencing databases very powerful. This database works the same as the medical one, but now draws on literature references made to tribal uses of food plants. You can't go at it by nutrient. There are several other Table options.