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Project Status: Active – The project has reached a stable, usable state and is being actively developed. cran checks R-check codecov rstudio mirror downloads cran version

An interface to the Integrated Taxonomic Information System (ITIS)

How to cite ITIS. From

To cite data obtained from ITIS, the following citation format is offered as a suggestion:

Retrieved [month, day, year], from the Integrated Taxonomic Information System on-line database,

ITIS is one of many different taxonomic data sources. Other include: Catalogue of Life (and COL+), NCBI taxonomy, International Plant Names Index, Index Fungorum, and more. The Wikipedia entry ( states that ITIS has a North American focus, but includes many taxa not in North America.


  • “mononomial”: a taxonomic name with one part, e.g, Poa
  • “binomial”: a taxonomic name with two parts, e.g, Poa annua
  • “trinomial”: a taxonomic name with three parts, e.g, Poa annua annua


Stable, CRAN version

Dev version



  • Please report any issues or bugs.
  • License: MIT
  • Get citation information for ritis in R doing citation(package = 'ritis')
  • Please note that this package is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.