The first description as
Cereus fascicularis was made in 1833 by
Franz Julius Ferdinand Meyen. The specific epithet fascicularis means 'bundle-like, tuft-like'. Friedrich Ritter placed the species in the genus Haageocereus in 1980. Further nomenclature synonyms are
Echinocactus fascicularis (Meyen) Steud. (1840),
Cactus fascicularis (Meyen) Meyen (1843),
Cereus fascicularis (Meyen) K.Schum. (1897, nom. inval.),
Trichocereus fascicularis (Meyen) Britton & Rose (1920) and
Weberbauerocereus fascicularis (Meyen) Backeb. (1942). == References ==