This genus is often considered as a part of the Euphorbia genus, due to many common characteristics, including the milky and irritating sap, that can be seen in between its layers. This plant grows in various areas of Africa, all extremely arid, thus it has brilliantly adapted to different environments, generating very different species: some of them fall in wonderful green waterfalls, some are arboreal, similar to palm trees, others are instead tuberculate and bushy, ranging in height: from a few tens of centimeters to several meters. Almost all species have inflorescences of a particular horseshoe shape and the most varied colors. It is a very resistant succulent, of a bright green color that, when exposed to the direct sun, tends to take on extraordinary reddish shades, making each plant unique in its kind!