# Isonym

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{{Short description|Term in botanical nomenclature}}
An '''isonym''', in [botanical taxonomy](/source/Plant_taxonomy), is a name of a [taxon](/source/taxon) that is identical to another designation, and based on the same [type](/source/Type_(biology)), but published at a different time by different authors.<ref name=ICN>{{harv|McNeill et al.|2012|loc=Article 6, Note 2}}</ref>  Citation from that source follows: 
{{bq|When the same name, based on the same type, has been published independently at different times by different authors, then only the earliest of these "isonyms" has [nomenclatural](/source/Nomenclature) status. The name is always to be cited from its original place of valid publication, and later isonyms may be disregarded.}}
That is, the later isonyms are to be discarded (they are not [botanical name](/source/botanical_name)s), and only the first one is to be used (though it is not necessarily the [accepted name](/source/Correct_name_(botany)) for a taxon).

An exception is made for family names that have been [conserved](/source/Conserved_name);<ref>{{harv|McNeill et al.|2012|loc=Article 14.5}}</ref> the place of publication listed for those names is considered to be correct and the name valid (and [legitimate](/source/Nomen_illegitimum)<ref>{{harv|McNeill et al.|2012|loc=Article 14.1}}</ref>), even if an earlier publication of the same name is discovered.

==See also==
* {{annotated link|[Basionym](/source/Basionym)}}
* {{annotated link|[Homonym (biology)](/source/Homonym_(biology))}}
* {{annotated link|[Isotype (biology)](/source/Isotype_(biology))}}, a duplicate of the holotype (not the type of an isonym)

==Notes==
<references/>

==References==
*{{cite book|last=McNeill|first=J.|year=2012|collaboration=Barrie, F.R.; Buck, W.R.; Demoulin, V.; Greuter, W.; Hawksworth, D.L.; Herendeen, P.S.; Knapp, S.; Marhold, K.; Prado, J.; Prud'homme Van Reine, W.F.; Smith, G.F.; Wiersema, J.H.; Turland, N.J. |volume=Regnum Vegetabile 154 |title=International Code of Nomenclature for algae, fungi, and plants (Melbourne Code) adopted by the Eighteenth International Botanical Congress Melbourne, Australia, July 2011 |publisher=A.R.G. Gantner Verlag KG  |isbn=978-3-87429-425-6 |url=http://www.iapt-taxon.org/nomen/main.php?page=title|ref={{harvid|McNeill et al.|2012}}}}

Category:Botanical nomenclature
Category:Taxonomy (biology)

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