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A cactus (pl. cacti, cactuses, or less commonly, cactus)[3] is a member of the plant family Cactaceae,[a] a family comprising about 127 genera with some 1750 known species of the order Caryophyllales.[4] The word cactus derives, through Latin, from the Ancient Greek word κάκτος (káktos), a name originally used by Theophrastus for a spiny plant whose identity is now not certain.[5] Cacti occur in a wide range of shapes and sizes. Although some species live in quite humid environments, most cacti live in habitats subject to at least some drought. Many live in extremely dry environments, even being found in the Atacama Desert, one of the driest places on Earth. Because of this, cacti show many adaptations to conserve water.

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