Orange. An orange is a fruit of various citrus species in the family Rutaceae; it primarily refers to Citrus sinensis, which is also called sweet orange, to distinguish it from the related Citrus aurantium, referred to as bitter orange.
   The sweet orange reproduces asexually; varieties of the sweet orange arise through mutations. The orange is a hybrid between pomelo and mandarin.
   The chloroplast genome, and therefore the maternal line, is that of pomelo. The sweet orange has had its full genome sequenced.
   The orange originated in a region encompassing Southern China, Northeast India, and Myanmar, and the earliest mention of the sweet orange was in Chinese literature in 314 BC. As of 1987, orange trees were found to be the most cultivated fruit tree in the world. Orange trees are widely grown in tropical and subtropical climates for their sweet fruit.
   The fruit of the orange tree can be eaten fresh, or processed for its juice or fragrant peel. As of 2012, sweet oranges accounted for approximately 70% of citrus production. In 2019, 79 million tonnes of oranges were grown worldwide, with Brazil producing 22% of the total, followed by China and India. Main article: Citrus taxonomy All citrus trees are angiosperms, belong to the single genus Citrus, and remain almost entirely interfertile. This includes grapefruits, lemons, limes, oranges, and various other types and hybrids. As the interfe
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