| Daidai | |
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| Subspecies: | Daidai
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| Trinomial name | |
| Citrus aurantium daidai | |
The daidai (Japanese: 橙, 臭橙; Chinese: 酸橙; Korean: 광귤, gwanggyul) is a variety of bitter orange native to Asian regions.
The daidai originated in the Himalayas. It spread to the Yangtze valley region and later to Japan. The colour of the fruit loses its yellowish hue and becomes greener in the spring. The native Japanese word for the color orange, (だいだい色) or daidai-iro, is derived from the name of this fruit.