Crest and monstose are mutations of the cellular structure.

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.

These 4 genera, in the Crassulaceae family, include plants from many parts of the world.

The Bromeliads, like Cactaceae and Agavaceae are a New World family.

Cissus is one of the largest genera of succulents, and one of the weirdest. Cyphostemma is a member of the Vitaceae or grape family.

Euphorbia is one of the largest of the succulent plant families. The genus Euphorbia is found throughout the tropics and semi tropics around the world, with some members of the family growing well into temperate regions.

Most of these are from Mexico, although they occur in the southern United States and into South America.

Four related genera native to South Africa that grow in a Mediterranean like environment with winter-rainfall; similar to that of Southern California.

A genus native to Africa containing about four hundred species of flowering succulent plants.