Cayenne Pepper

The cayenne pepper—also known as the Guinea spice,[1] cow-horn pepper, aleva, bird pepper,[2] or, especially in its powdered form, red pepper—is a hot chili pepper used to flavour dishes. It is red colored when ripened to maturity, but also eaten while still green. It is a cultivar of Capsicum annuum related to bell peppers, jalapeños, paprika and others. The Capsicum genus is in the nightshade family (Solanaceae).

(Ingredient Description Reference: http://en.wikipedia.org/wiki/Cayenne_pepper)