isonym
Sign in to saveAn isonym, in botanical taxonomy, is a name of a taxon that is identical to another designation, and based on the same type, but published at a different time by different authors. Citation from that source follows:
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An isonym, in botanical taxonomy, is a name of a taxon that is identical to another designation, and based on the same type, but published at a different time by different authors. Citation from that source follows:
That is, the later isonyms are to be discarded (they are not botanical names), and only the first one is to be used (though it is not necessarily the accepted name for a taxon).
Excerpted from Wikipedia’s “isonym” article, available under the CC BY-SA 4.0 licence.