Taxonomy and systematics

International Working Group on Taxonomic Databases	An international forum for biological databases, standards, and data exchange.
The International Association for Plant Taxonomy	Established in 1950 to carry out projects of international interest to systematic biologists. Publishers of the International Code of Botanical Nomenclature (ST LOUIS CODE).
Integrated Taxonomic Information System	Taxonomic information on plants, animals, and microbes of North America and the world.
International Plant Names Index	Names and bibliographic details of all seed plants resulting from a collaboration between Kew, the Gray Card Index and the Australian National Herbarium
w3Topicos	Nomenclatural database and associated authority files of the Missouri Botanical Garden

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