Bitter orange, Seville orange, sour orange, bigarade orange, or marmalade orange is the citrus tree Citrus × aurantium and its fruit. It is native to Southeast Asia and has been spread by humans to many parts of the world

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La naranja amarga, la naranja de Sevilla, la naranja agria, la naranja bigarade o la mermelada de naranja son los cítricos Citrus × aurantium y su fruto. Es originaria del sudeste asiático y los humanos la han propagado a muchas partes del mundo.