Mammillaria is one of the larger genera in the Cactus family, and one of the most variable, but only some have hooked spines.
Caudiciform plants, also known as ‘Fat Plants’, are a grouping of many totally unrelated plants all having a fat, short, swollen stem-trunk.
A genus of cacti from the dry coastal deserts, particularly the Atacama Desert, of northern Chile.
These 3 genera produce rosettes with thick leaves. Graptopetalum is native to Mexico and Arizona. Graptoveria and Pachyveria are nursery hybrids.
These 2 caudiciform genera, are unrelated except that they are both from Africa and Southeast Asia and are named after the country Aden.
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.
These 3 genera, in the Crassulaceae family, include plants from many parts of the world.
Astrophytum (Bishop's Hat) is a (mostly) star shaped cactus from north/central Mexico and southern Texas, USA.