Orange

The most popular of the citrus fruits exists in two species: Citrus aurantium and C. sinensis. The former is the bitter (or Seville) orange and the latter comprises the vast range of sweet oranges, for eating out of hand or turning into juice. Their wild ancestors are thought to have grown in the region of SW China and NW India, but the growing of cultivated varieties has in modern times become concentrated in the Americas, where Brazil and the USA between them account for over two-thirds of world production.