Genus Myrtillocactus is a type of cactus that belongs to the family Cactaceae. There are several synonyms for this genus, which include names like Cereus georgii, Cereus myrtillocactus, and Myrtillocereus geometrizans. The name Myrtillocactus comes from the Greek word "myrtos," which means "myrtle," and "kaktos," which means "cactus." This plant is characterized by its blue-green stems, which are often covered in long thorns. It is native to Mexico and Central America and can grow up to 30 feet tall in the right conditions. These synonyms are often used interchangeably in plant catalogs and botanical literature.