homonym

A name identical in spelling to another, yet based on a different *type. The *International Code of Botanical Nomenclature rules that all homonyms except the earliest are illegitimate. For example, Viburnum fragrans Bunge, described in 1831, is a later homonym of Viburnum fragrans Loisel., which was described in 1824. Since this was the first published name for the taxon, it must be adopted.