The plant’s common name is derived from the fact that in many villages and towns of Mexico it is used to construct a living fence, mainly along roadways.

Source: Horticulture Unlimited Inc.

Scientific classification

Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Tribe: Pachycereeae
Genus: Pachycereus
Species: P. marginatus

                         – Wikipedia.