The first description was made in 1920 by
Nathaniel Lord Britton and
Joseph Nelson Rose. The specific epithet gaumeri honors the American botanist and naturalist
George Franklin Gaumer (1850–1929), who discovered the species. Nomenclature synonyms are
Anisocereus gaumeri (Britton & Rose) Backeb. (1942) and
Pachycereus gaumeri Britton & Rose (1920). Taxonomic synonyms are
Cereus yucatanensis Standl. (1930),
Pterocereus foetidus T. MacDoug. & Miranda (1954),
Anisocereus foetidus (T.MacDoug. & Miranda) W.T.Marshall (1957),
Pachycereus foetidus (T.MacDoug. & Miranda) P.V.Heath (1992). ==References==