The orange (specifically, the sweet orange) is the fruit of the citrus species Citrus × sinensis in the family Rutaceae. The fruit of the Citrus sinensis is called sweet orange to distinguish it from that of the Citrus aurantium, the bitter orange. The orange is a hybrid, possibly between pomelo (Citrus maxima) and mandarin (Citrus reticulata), cultivated since ancient times.
Probably originating in Southeast Asia, oranges were already cultivated in China as far back as 2500 BC. Arabo-phone peoples popularized sour citrus and oranges in Europe; Spaniards introduced the sweet orange to the American continent in the mid-1500s.
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