This database ius a citator, but its contents include secondary sources such as PhD theses, so you cannot always find pointers to primary sources mentioning the plants, and secondary sources do not give the date at which the info was collected, nor by whom. The 4 AGIS databases are the project of the U.S. Department of Agriculture's research section, programming created by the Genome Informatics Group . It is very usable now, with 3700 plants, but much more could and should be added, both in data content and programming for effective use. For now, it is the most powerful tool available to Native Plant Uses researchers. These aggie databases appear to have been inspired by the U. Mich one, and then to have gone beyond to try to prepare native plant data in ways parallel to the way the research labs do for agricultural plants.
Data sources are the same oldish reports.
But the additional AGIS ethnobotany databases make the combined, cross-refencing databases very powerful. You can't go at it by nutrient. There are several other Table options. This database is both exciting and frustrating. Obviously they would like to expand this database, if government support and personnel cuts were to permit.