district of Texas, and from early October to January in Florida; its peel and juice color are poor, as is the quality of its juice Pera: grown in Brazil, it is very popular in the Brazilian citrus industry and yielded 7.5 million metric tons in 2005 Pera Coroa: grown in Brazil Pera Natal: grown in Brazil Pera Rio: grown in Brazil Pineapple: grown in North and South America and India Pontianak: oval-shaped orange grown especially in Pontianak, Indonesia Premier: grown in South Africa Rhode Red: is a mutation of the Valencia orange, but the color of its flesh is more intense; it has more juice, and less acidity and vitamin C than the Valencia; it was discovered by Paul Rhode in 1955 in a grove near Sebring, Florida Roble: it was first shipped from Spain in 1851 by Joseph Roble to his homestead in what is now Roble's Park in Tampa, Florida; it is known for its high sugar content Queen: grown in South Africa Salustiana: grown in North Africa Sathgudi: grown in Tamil Nadu, South India Seleta, Selecta: grown in Australia and Brazil, it is high in acid Shamouti Masry: grown in Egypt; it is a richer variety of Shamouti Sunstar: grown in Florida, this newer cultivar ripens in mid-season (December to March) and it is more resistant to cold and fruit-drop than the competing Pineapple variety; the color of its juice is darker than that of the competing Hamlin Tomango: grown in South Africa Verna: grown in Algeria, Mexico, Morocco, and Spain Vicieda: grown in Algeria, Morocco, and Spain Westin: grown in Brazil Xã Đoài orange: grown in Vietnam Navel Navel oranges are characterized by the growth of a second fruit at the apex, which protrudes slightly and resembles a human navel. They are primarily grown for human consumption for various reasons: their thicker skin makes them easy to peel, they are less juicy and their bitterness—a result of the high concentrations of limonin and other limonoids—renders them less suitable for juice. Their widespread distribution and long harvest period have made navel oranges very popular. In the United States, they are available from November to April, with peak supplies in January, February, and March. According to a 1917 study by Palemon Dorsett, Archibald Dixon Shamel and Wilson Popenoe of the United States Department of Agriculture (USDA), a single mutation in a Selecta orange tree planted on the grounds