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It's an easy choice to name a cactus after its common name. But there can be confusion and overlaps in common names. So a more precise, unique choice is opting for a cactus' scientific name. So for example, a prickly pear cactus can be called Opuntia; or an old man cactus Cephalocereus, Espostoa or Oreocereus.

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15y ago

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