Other tangors include the Iyokan and Ortanique varieties. Grapefruits themselves are probably hybrids between sweet oranges and pummelos in Barbados. The year 1956 saw the discovery of the chironja in Puerto Rico. The chironja is an orange and grapefruit, or orange and tangelo hybrid. Orange and grapefruit crossbreeds are also termed orangelos.
Tangelos are the result of hybridization between mandarins and grapefruits.
When C. sinensis is crossed with Poncirus , the outcome is termed a citrange. Production Janick et. Regions of citriculture lie within about thirty-five degrees of latitude north and south of the equator and the main commercial operations are contained within twenty degrees north and south. Fifty percent of citrus growing occurs in North and Central America and the Mediterranean region. South America, the Far East and the southern hemisphere, including South Africa and Australia, are responsible for twenty-five, fifteen and five percent, respectively.