This is not a cactus. It is a Euphorbia plant. With one limited exception, all cactus originated in the New World, i.e. North and South America. This particular euphorbia originated in Africa. Cactus are defined as plants with spines that are produced from specialized structures called areoles. There are hundred and 27 genera and approximately 1750 known species of cactus Euphorbias range from tiny annual plants to large and long-lived trees. The genus has over or about 2,000 members, See Wikipedia: Euphorbia.
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