''Cereus ayisyen'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

cactus A cactus (, or less commonly, cactus) is a member of the plant family Cactaceae, a family comprising about 127 genera with some 1750 known species of the order Caryophyllales. The word ''cactus'' derives, through Latin, from the Ancient Greek ...

from

Haiti Haiti (; ht, Ayiti ; French: ), officially the Republic of Haiti (); ) and formerly known as Hayti, is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean Sea, east of Cuba and Jamaica, and ...

. It was originally named ''Cereus haitiensis'', but that name is illegitimate as it had already been used for another species. The

specific epithet In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

''ayisyen'' means "Haitian" in

Haitian Creole Haitian Creole (; ht, kreyòl ayisyen, links=no, ; french: créole haïtien, links=no, ), commonly referred to as simply ''Creole'', or ''Kreyòl'' in the Creole language, is a French-based creole language spoken by 10–12million people wor ...

.van der Meer, M.H.J. (2019). A New Name for ''Cereus haitiensis'' A.R.Franck & Peguero (Cactaceae). Cactologia Phantastica 4(2): 13-15
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References

ayisyen Flora of Haiti Flora without expected TNC conservation status {{Cactus-stub