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
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Illinois Wildflowers Genus
BOLDS images II Genus
BOLDS resource for species-level taxa Genus
BioImages resource
NMNH Botany Elevation Data Genus
DC Spring Flower Dates Genus
EOL Group on Flickr Genus
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GBIF national node classification resource: Germany Genus
GBIF national node type records: United Kingdom Genus
Global Biotic Interactions Genus
Global Biotic Interactions Genus
Global Compendium of Weeds Species
  • Barbarea
Herbarium Specimen Images (E)
Herbarium Specimen Images (E) Genus
IABIN resource Genus
IUCN Red List Genus
BOLDS resource for higher-level taxa Import Import Genus
Integrated Taxonomic Information System (ITIS)
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NCBI Taxonomy
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NMNH Botany Plant Habit Data Genus
NatureServe resource Genus
Smithsonian type specimen data Genus
India Biodiversity Portal Species Data Genus
Taxonomic Hierarchy of COL-China 2012
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Tropicos resource Genus
Tropicos resource Genus
USDA PLANTS Structured Data
  • Barbarea
USDA Plants
USDA Plants Genus
Wikimedia Commons Genus
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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