Cyphostemma cirrhosum Big Plant! Cactus This is considered by many

This is considered by many to be a form of Eriosyce senilis

The caudex is lumpy and brown

Euphorbia stenoclada Family: Euphorbiaceae

It isn't a full sun plant in most areas

Melocactus azureus Family: Cactaceae

Cyphostemma cirrhosum Big Plant! Cactus This is considered by manyCyphostemma cirrhosum Family: Vitaceae. This grape relative is an interesting caudiciform with thick green leaves and vines. The caudex itself is extremely attractive, especially once it starts gaining some size. It is fat with peeling white to brownish skin or bark. The plant grows as a vine and the caudex will get several inches thick in time. A mature plant can be raised to show off the woody roots too. Easy to grow. Likes a fair amount of water