Dudleya from North America, Cotyledon from South Africa to Arabia
Three cactus genera from the Southern USA and Northern Mexico.
Gasteria is a genus of succulent plants, native to South Africa (and the far south-west corner of Namibia).
Small to medium cacti from USA and Mexico, often with brilliant flowers.
The varied genus Crassula contains around 200 species and many cultivars.
Eriosyce from Chile and Peru.
Mammillaria is one of the larger genera in the Cactus family, and one of the most variable.