The African milk tree (Euphorbia trigona) goes by many names, including cathedral cactus, friendship cactus, and good luck ...

A tender, slow-growing, architectural succulent shrub producing very upright stems and branches to 1.8m (6ft) high. These are reddish-green and three to four sided, with short-lived, oval, ...

A tender, clump-forming, slow-growing succulent producing roughly spherical, leafless and spineless stems to 12.5cm (5in) in diameter with 8-12 vertical, angled ribs, variably marked with narrow, ...

Though some types of cactuses, like the prickly pear, have been consumed in Central America and Mexico for thousands of years, cactus is not routinely a food in most parts of the world.