Ariocarpus is one of the treasures of the world of Cacti, from Central to Northern Mexico and Southern Texas. Obregonia, the artichoke cactus, is a genus of cacti with a single species, from Mexico.
Melocactus are recognizable by the large cephalium that develops on mature plants. They are native from Brazil to Southern Mexico, including the Caribbean.
Parodia, native to the uplands of Argentina, Peru, Bolivia, Brazil, Colombia and Uruguay. Notocactus, with the center of the genus in Brazil and Argentina, but with members throughout the Eastern side of the Andes.