International Code of Nomenclature for algae, fungi, and plants

[3] The 2025 edition of ICBN, the Madrid Code, which reflects the decisions of the Twentieth International Botanical Congress met in Madrid, Spain, in July 2024, is prepared to be published in July 2025.

[6][7] Unlike modern Codes, it contained recommendations for naming to serve as the basis for discussions on the controversial points of nomenclature, rather than obligatory rules for validly published and legitimate names within the Code.

Multiple attempts to bring more "expedient" or more equitable practice to botanical nomenclature resulted in several competing codes, which finally reached a compromise with the 1930 congress.

These rules were published as the Règles internationales de la Nomenclature botanique adoptées par le Congrès International de Botanique de Vienne 1905 (or in English, International rules of Botanical Nomenclature adopted by the International Botanical Conference of Vienna 1905).

The Nomenclature Section of the 18th International Botanical Congress in Melbourne, Australia (2011) made major changes:[2][8][9][10] All the versions are listed below.