If you were to visit the city of Seville, you would find the streets lined with thousands of evergreen citrus trees. Named after the city because they have been grown there as an ornamental since the end of the 12th century, Seville orange (Citrus aurantium) is also called bitter orange or sour orange. In contrast to its relative sweet orange (Citrus sinensis), Seville orange fruits have a bitter peel and sour pulp and are not eaten as fresh fruit. The trees are widely used as an ornamental and as rootstock for edible citrus, but the fruits also have many uses.Native to Asia, the Seville orange traveled to the Pacific Islands during prehistory and to the Mediterranean area. It was reported growing in Sicily in 1002 A.D. and Arabs grew it during the ninth century