The varied genus Crassula contains around 200 species and many cultivars.
Caudiciform plants, also known as ‘Fat Plants’, are a grouping of many totally unrelated plants all having a fat, short, swollen stem-trunk.
All variegates are mutants. Something has gone wrong with the cellular structure of the leaf or stem growth tip (apical meristem) of the plant.
Sometimes called "Living Stones".
These 2 caudiciform genera, are unrelated except that they are both from Africa and Southeast Asia and are named after the country Aden.
These 3 genera, in the Crassulaceae family, include plants from many parts of the world.
The Bromeliads, like Cacti and Agavaceae are a New World family.
There are around 200 species in the genus, most from Mexico, some from the southern United States and into South America.