This large family of fruit includes among its members the citron, grapefruit, kumquat, lemon, lime, orange, shaddock, tangelo, tangerine and ugli fruit. Native to Asia, citrus fruits prefer tropical to temperate climates and thrive in many Central and South American countries, as well as the states of Arizona, California, Florida, Louisiana and Texas. All fresh citrus fruits share some degree of tartness and are rich in vitamin C.