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<p>The U.S. Agricultural Research Service has several phytochemical and ethnobotanical databases allowing searches for plants. Plants searches can be limited by chemical activities of a plant, high concentration chemicals, chemicals with one activity, ethnobotanical uses, and other categories. The site's "documents" area offers access to an ethnobotanical dictionary and mini-courses in the field. (Frances Garrett 2003-01)</p>