Table 1.

External web resources currently linked to taxon names cited within PhytoKeys papers, provided through the Pensoft Taxon Profile (PTP) (www.ptp.pensoft.eu) (see also Penev et al. 2010a).

Source name	Web address
General sources
Global Biodiversity Information Facility	www.gbif.org
Encyclopedia of Life	www.eol.org
Catalogue of Life	www.catalogueoflife.org
ITIS	www.itis.gov
uBio	www.ubio.org
WoRMS – World register of Marine Species	www.marinespecies.org
BioLib	www.biolib.cz
Plazi	www.plazi.org
IUCN – International Union for Conservation of Nature	www.iucn.org
Wikipedia	www.wikipedia.org
Wikispecies	www.species.wikimedia.org
Taxon-oriented sources
International Plant Name Index	www.ipni.org
Tropicos	www.tropicos.org
PLANTS Database	www.plants.usda.gov
The Gymnosperm Database	www.conifers.org
Gene sequences
NCBI - National Center for Biodiversity Information	www.ncbi.nlm.nih.gov
Barcode of Life Data Systems	www.boldsystems.org
Images
Morphbank	www.morphbank.net
Wikimedia	www.wikimedia.org
Yahoo	www.images.search.yahoo.com
Literature references
Google Scholar	www.scholar.google.com
PubMed	www.ncbi.nlm.nih.gov/pubmed
BHL - Biodiversity Heritage Library	www.biodiversitylibrary.org