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isonym (noun, pl. isonyms;nomenclature term) – identical names based on the same type published at different occasions by the same or different authors.

The botanical code of nomenclature (St. Louis Code Art. 6.3. Note 1) states: "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 so-called 'isonyms' has nomenclatural status. The name is always to be cited from its original place of valid publication, and later "isonyms" may be disregarded."

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