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Fruit of Citrus paradisi; thought to have arisen as a sport (mutation) of the pomelo or shaddock (Citrus grandis), a coarser citrus fruit, or as a hybrid between pomelo and sweet orange. It contains 35–40 mg vitamin C per 100 g. The pith contains naringin, which is very bitter. Named by the botanist John Lunan in Hortus Jamaicanensis (1814) because the fruits grow in ‘grape-like’ clusters. The ruby grapefruit, with red flesh, was discovered as a sport in Texas in 1929.

Subjects: Medicine and Health — Cookery, Food, and Drink.

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