Scientists aim to describe a single 'tree of life' that reflects the evolutionary relationships of living things. However, evolutionary relationships are a matter of ongoing discovery, and there are different opinions about how living things should be grouped and named. EOL reflects these differences by supporting several different scientific 'classifications'. Some species have been named more than once. Such duplicates are listed under synonyms. EOL also provides support for common names which may vary across regions as well as languages.

Preferred marks the preferred classification for this taxon.

Recognized By Rank Classification
Species 2000 & ITIS Catalogue of Life: April 2013
view in classification
Genus Import Genus
BOLDS resource for higher-level taxa
  • Ferocactus
BOLDS images II Genus
BOLDS resource for species-level taxa Genus
NMNH Botany Elevation Data Genus
Botany resource Genus
Conabio Genus
EOL Group on Flickr Genus
EOL Group on Flickr Genus
  • Ferocactus
view in classification
GBIF national node type records: France Genus
GBIF national node type records: United Kingdom Genus
IUCN Red List Genus Import
BHL: BioDivLibrary's photostream Genus
Integrated Taxonomic Information System (ITIS)
view in classification
NCBI Taxonomy
view in classification
NatureServe resource Genus
Smithsonian type specimen data Genus
Ori Fragman's TrekNature Gallery
  • Ferocactus
Tropicos resource Genus
USDA PLANTS Structured Data
  • Ferocactus
USDA Plants
USDA Plants Genus
Wikimedia Commons Genus
Wikimedia Commons
  • Ferocactus Britton & Rose (1922)
  • Ferocactus Britton & Rose
Wikipedia Genus
eFloras Genus
iNaturalist Images Genus


EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

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