What is ex in plant names?
The word ex is mainly used in circumstances in which there is an author (or authors) who only contributes the name of a taxon, while it is a different author (or authors) who actually validly publishes that name. In these cases, the author(s) who ascribed the name is separated from the publishing author(s) by ex.
taxon: a scientifically classified group or entity : a taxonomic unit (such as a genus or order) of any rank
valid: well-grounded or justifiable : being at once relevant and meaningful
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