Citrus existed 20 million years ago and its origin is in Southeast Asia. Since then they have spread throughout the world and have evolved in very different ways, leaving many varieties. In the seventeenth Sigli reached Barbados Islands and from there came to the U.S., which is the largest producer and consumer. Grapefruit is family of the genus of Rutaceae Citrus. It's a hybrid that arose between the pummelo and sweet orange citrus. The main producers are in U.S. grapefruit to mind: Argentina, Cuba, Israel, Cyprus, Mozambique, Mexico and South Africa.