Its name is a nice anagram of Mendoza, the Argentine city, from which this wonderful cactus mainly comes. This genus includes only two species, both consisting of a globular body, which remains spherical for a long period before becoming slightly columnar. It has wavy ribs, covered by long sturdy spines, often curved, which protect the plant. Its peculiarity compared to other cacti are certainly the flowers, which are usually of a red color and that remain always closed! It is a cactus with a very slow growth but also extremely long-lived. Not many people know that, due to its robust spines, it is one of the few plants used as an "amplified cactus": this plant is used as an unusual musical instrument, mainly in South America, in which a delicate and pleasant sound is produced by running your hand over the big quills!