Why So Many of the World’s Hottest Peppers Belong to One Species

Habaneros, Scotch bonnets, ghost peppers, Carolina Reapers and Pepper X all belong to Capsicum chinense, a species mistakenly named as if it came from China.

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One of the strangest facts about super-hot chili peppers is that many of the varieties famous for extreme heat belong to the same species, Capsicum chinense. That group includes familiar peppers such as habaneros and Scotch bonnets, as well as several record-setting varieties including ghost peppers, Trinidad scorpions, Carolina Reapers and Pepper X. The species name itself is a historical mistake. A Dutch botanist gave it the name in the 1700s because he believed the plant came from China, even though Capsicum species originated in the Americas. Capsicum chinense is associated with tropical regions of the Americas, with its deeper origins traced to the Amazon region. The plants later spread around the world, and people in different regions selectively bred them into distinct varieties with different shapes, flavors and levels of heat. That helps explain why a pepper developed and cultivated in one part of the world can still belong to a species with much older American roots. The heat comes from capsaicinoids, especially capsaicin, which activate heat and pain receptors in the body. Scoville Heat Units are commonly used to describe pepper heat. The current Guinness World Records holder for the hottest chili pepper is Pepper X, measured at an average of 2,693,000 Scoville Heat Units in testing reported in 2023. By comparison, a typical jalapeno is only a few thousand Scoville Heat Units. The broader story is therefore not simply about increasingly hot peppers. It is also about plant domestication, selective breeding, mistaken scientific names and how crops native to the Americas became deeply embedded in cuisines around the world.

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