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The Cayenne pepper. is a bit milder, rating at 30,000 to 50,000 Scoville units. They're named after the French Guiana city of Cayenne. I'm sure you're familiar with the Cayenne pepper; it's ground and sold as a pretty common spice.
Cayenne pepper powder lasts longer than fresh cayenne peppers, and because it is dried and powdered, the spiciness is more concentrated. Only a small amount of cayenne pepper is needed to give a dish a spicy profile. The powder may be sprinkled at the end of the cooking process, or it may be added at the beginning.