International Botanical Congress (IBC) is a large-scale meeting of botanists in all scientific fields, from all over the world. These days it is held every six years, with the venue circulating around the world. The latest was the XVII IBC in Vienna, a hundred years after the II IBC in Vienna. The last but one was in St Louis (1999). Botany is the scientific study of plant life. ...

The IBC has the power to alter the ICBN. Formally the power resides with the Plenary Session, but in practice this just approves the decisions of the Nomenclature Section. The Nomenclature Section meets before the actual Congress and deals with all proposals to modify the ICBN: this includes ratifying recommendations on conservation. To reduce the risk of a hasty decision the Nomenclature Section adopts a 60% majority as needed for any change. The International Code of Botanical Nomenclature is the set of rules according to which plants are given their formal botanical names (scientific names). ... In botany, conservation is a nomenclatural procedure governed by Art 14 of the ICBN. Its purpose is to avoid disadvantageous nomenclatural changes entailed by the strict application of the rules, and especially of the principle of priority [...] (Art 14. ...