The International Code of Nomenclature for Cultivated Plants (ICNCP, Cultivated Plant Code) regulates the names of cultigens (plants whose origin or selection is primarily due to intentional human activity). These are, for the most part, plants with names in the classification categories cultivar, Group and  grex, the classification categories within the scope of the Cultivated Plant Code (as specified in the 2009 Cultivated Plant Code).