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Trifoliate Orange is a member of the family Rutaceae. It differs from Citrus in having deciduous, compound leaves, and pubescent fruit. It is native to northern China and Korea, and is also known as the Chinese Bitter Orange. The plant is fairly hardy and will tolerate moderate frost and snow, making a large shrub or small tree 4–8 m tall.

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Synsepalum dulcificum, also known as the miracle fruit, is a plant with a berry that, when eaten, causes sour foods (such as lemons and limes) subsequently consumed to taste sweet. This effect lasts until the protein is washed away by saliva (up to about 60 minutes).

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Citrus bergamia, the Bergamot orange is a fragrant fruit the size of an orange, with a yellow colour similar to a lemon. Genetic research into the ancestral origins of extant citrus cultivars found bergamot orange to be a likely hybrid of Citrus limetta and Citrus aurantium.

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