A nomen illegitimum (Latin for "illegitimate name") is a technical term, used mainly in botany. It is usually abbreviated as nom. illeg..
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This term refers to a validly published name, but one that contravenes some of the articles laid down by the International Botanical Congress.[1]
A nomen illegitimum could be a validly published name that must be rejected for the purposes of priority in accordance with the International Code of Botanical Nomenclature.[1] The name could be superfluous at its time of publication either because the taxon (as represented by the type specimen) already has a name (a superfluous name), or because the name has already been applied to another plant (a homonym).
Nymphaea minima F.M.Bailey, nom. illeg.