Global Biodiversity Information Facility - data portal (GBIF)
Biodiversity Information Standards (TDWG)
Species 2000 (Indexing the world’s known species, ITIS, “Catalogue of Life”)
Encyclopedia of Life (EoL)
electronic Plant Information Centre (ePIC)
Provisional Global Plant Checklist (International Organization for Plant Information)
Harvard University Herbaria - databases
The Species Toolkit (search engine)
International Plant Name Index Query (IPNI)
W3TROPICOS (Missouri Botanical Garden’s VAST)
The European GTI Toolkit (Capacity Building for the Global Taxonomy Initiative)
Department of Botany, Natural History Museum, in London - database page
Integrated Taxonomic Information System (ITIS)