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The Ambersweet, while classified as an orange for both fresh and processing purposes, is actually a rather complex citrus hybrid. Developed by Dr. C. J. Hearn of the United States Department of Agriculture Horticultural Research Station in Orlando, Ambersweet is a hybrid of Clementine tangerine by Orlando tangelo crossed with a seedling mid-season sweet orange. Since one of the parents was part tangelo (a tangerine-grapefruit hybrid) Ambersweet would be 3/8 tangerine, 1/8 grapefruit and 1/2 sweet orange.