Obregonia Denegrii, nicknamed Artichoke Cactus, it the only species in the obregonia genus. It is also classified as strombocatus denegrii. This prized cactus is closely related to the ariocarpus genus and bares similar characteristics. Like ariocarpus, it is sometimes referred to as a living rock. These seeds will produce plants with incurved tubercles and white flowers. Denegrii is native to Tamaulipas, Mexico where it is now endangered due to a variety of factors including habitat loss, collection for medical, scientific and collective purposes and uprooting by livestock. It is said to have antibiotic activity and was one of several cacti species to be considered a false peyote by the Tarahumara people of Mexico. This solitary, low-laying cactus, which typically stays under six inches, is often shadowed by shrubbery. For that reason, it prefers light shade. For brief periods, it can survive temps as low as 20 degrees Fahrenheit. Being a slow-growing ornamental, it is a great candidate for grafting onto faster-growing root stock such as San Pedro, blue myrtle or pereskiopsis.