| Citrus × aurantium |
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| Scientific classification |
| Kingdom: |
Plantae |
| Clade: |
Tracheophytes |
| Clade: |
Angiosperms |
| Clade: |
Eudicots |
| Clade: |
Rosids |
| Order: |
Sapindales |
| Family: |
Rutaceae |
| Genus: |
Citrus |
| Species: |
C. × aurantium |
| Binomial name |
Citrus × aurantium
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| Synonyms |
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- Aurantium × acre Mill.
- Aurantium × bigarella Poit. & Turpin
- Aurantium × corniculatum Mill.
- Aurantium × corniculatum Poit. & Turpin
- Aurantium × coronatum Poit. & Turpin
- Aurantium × distortum Mill.
- Aurantium × humile Mill.
- Aurantium × myrtifolium Descourt.
- Aurantium × orientale Mill.
- Aurantium × silvestre Pritz.
- Aurantium × sinense (L.) Mill.
- Aurantium × variegatum Barb.Rodr.
- Aurantium × vulgare (Risso) M. Gómez
- Citrus bigaradia Risso & Poit.
- Citrus humilis (Mill.) Poir.
- Citrus × amara Link
- Citrus × benikoji Yu.Tanaka
- Citrus × bigaradia Loisel.
- Citrus × calot Lag.
- Citrus × canaliculata Yu.Tanaka
- Citrus × changshan-huyou Y.B.Chang
- Citrus × communis Poit. & Turpin
- Citrus × dulcimedulla Pritz.
- Citrus × dulcis Pers.
- Citrus × florida Salisb.
- Citrus × funadoko Yu.Tanaka
- Citrus × fusca Lour.
- Citrus × glaberrima Yu.Tanaka
- Citrus × humilis (Mill.) Poir.
- Citrus × intermedia Yu.Tanaka
- Citrus × iwaikan Yu.Tanaka
- Citrus × iyo Yu.Tanaka nom. inval.
- Citrus × kotokan Hayata
- Citrus × medioglobosa Yu.Tanaka
- Citrus × mitsuharu Yu.Tanaka
- Citrus × myrtifolia (Ker Gawl.) Raf.
- Citrus × natsudaidai (Yu.Tanaka) Hayata
- Citrus × omikanto Yu.Tanaka
- Citrus × pseudogulgul Shirai
- Citrus × rumphii Risso
- Citrus × sinograndis Yu.Tanaka nom. inval.
- Citrus × subcompressa (Tanaka) Yu.Tanaka
- Citrus × sulcata Yu.Tanaka nom. inval.
- Citrus × taiwanica Yu.Tanaka & Shimada
- Citrus × tengu Yu.Tanaka nom. inval.
- Citrus × tosa-asahi Yu.Tanaka
- Citrus × vulgaris Risso
- Citrus × yatsushiro Yu.Tanaka
- Citrus × yuge-hyokan Yu.Tanaka
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The bitter orange, sour orange, Seville orange, bigarade orange, or marmalade orange is the hybrid citrus tree species Citrus × aurantium, and its fruit. It is native to Southeast Asia and has been spread by humans to many parts of the world. It is a cross between the pomelo, Citrus maxima, and the wild type mandarin orange, Citrus reticulata. The bitter orange is used to make essential oil, used in foods, drinks, and pharmaceuticals. The Seville orange is prized for making British orange marmalade.