basonym
noun
ba·so·nym
ˈbā-sə-ˌnim,
-sō-
plural -s
: the earliest validly published name of a taxon, being in the case of a binomial or trinomial the source of the valid specific or subspecific epithet when the taxon is transferred to a new combination and in technical usage always accompanied by the name of the original author
Crataegus spicata Lamarck is the basonym of Amelanchier spicata
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Merriam-Webster unabridged
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