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To be fair, “cayenne” actually describes a group of hot pepper varieties in the C. annuum species. Cayenne peppers range from long and curly, to short and straight, and many in between.

FAQ: Can I use paprika instead of crushed red pepper, or vice versa, and what impact does it have on a dish?

Physical Characteristics

First off, capsaicin affects every animal species besides birds. These feathered friends don't experience the pain caused by capsaicin, which makes them the plants´ greatest ally in carrying seeds over long distances. This is a great example of evolution; it just makes sense to produce a compound that repels potential predators but does not affect your greatest seed carriers.