The cacti species Opuntia phaeacantha and Opuntia polyacantha have the longest spines of US Southeastern species. The Peruvian Torch cactus has spines which are 6 inches long. These cacti are native to the regions of the high Andes Mountains.
I don’t think there is any one species of cactus with longer thorns than any other. Individual cacti are variant enough within a single species that a range of thorn lengths has been observed on each of them.
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