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Serrano pepper. The serrano pepper (Capsicum annuum) is a type of chili pepper that originated in the mountainous regions of the Mexican states of Puebla and Hidalgo. The name of the pepper is a reference to the mountains (sierras) of these regions.
Szechuan peppers is native to the Szechwan province of China. Though they bear some resemblance to black peppercorns, they are not of the pepper family, but the dried berry of a tree of the rue family.