The Christmas cactus, also known as the Holiday cactus, or more accurately, Schlumbergera, is a trailing tropical cactus that ...

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A spherical ribbed cactus, up to 8cm across, with an evergreen stem with up to twenty ribs along which are star-shaped clusters of up to ten recurved spines, and flowering stems, held above the main ...

A cactus with solitary or clustered spherical stems to 5cm diameter, bearing brown to grey radial spines to 5cm long, and slender-tubed pale or deep red flowers to 7cm across ...

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.