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Images of Cactus Anatomy

  1. Cacti inhabit diverse regions, from coastal plains to high mountain areas. With one exception, they are native to the Americas, where their range extends from Patagonia to British Columbia and Alberta in western Canada. A number of centers of diversity exist. For cacti adapted to drought, the three main centers are Mexico and the southwestern United States; the southwestern Andes, where they are found in Peru, Bolivia, Chile an… See more

    Overview

    A cactus (pl.: cacti, cactuses, or less commonly, cactus) is a member of the plant family Cactaceae (/kækˈteɪsi.iː, -ˌaɪ/), a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. Th… See more

    Morphology

    The 1,500 to 1,800 species of cacti mostly fall into one of two groups of "core cacti": opuntias (subfamily Opuntioideae) and "cactoids" (subfamily Cactoideae). Most members of these two groups are easily recognizabl… See more

    Adaptations for water conservation

    All cacti have some adaptations to promote efficient water use. Most cacti—opuntias and cactoids—specialize in surviving in hot and dry environments (i.e. are xerophytes), but the first ancestors of modern cacti were already ad… See more

    What is inside a cactus?
    As we’ve discovered, the inside of a cactus is far more intricate than its prickly exterior would suggest. Its structural adaptations – from moisture-sealing skin and expandable tissue to specialized vascular strands – converge to store and transport water in hot, arid environments.
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