| Trifoliate orange | |
|---|---|
| |
| A fruiting tree in Jardin des Plantes, Paris | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Sapindales |
| Family: | Rutaceae |
| Genus: | Citrus |
| Species: | C. trifoliata
|
| Binomial name | |
| Citrus trifoliata | |
| Synonyms[1] | |
| |
The trifoliate orange, Citrus trifoliata (syn.Poncirus trifoliata), is a member of the family Rutaceae. Whether the trifoliate oranges should be considered to belong to their own genus, Poncirus, or be included in the genus Citrus is debated. The species is unusual among citrus for having deciduous, compound leaves and pubescent (downy) fruit.[2][3]
It is native to northern China and Korea, and is also known as the Japanese bitter-orange (karatachi),[4] hardy orange[5] or Chinese bitter orange.
The plant is a fairly cold-hardy citrus (USDA zone 6) and will tolerate moderate frost and snow, making a large shrub or small tree 4–8 m (13–26 ft) tall. Because of its relative hardiness, citrus grafted onto Citrus trifoliata are usually hardier than when grown on their own roots.[6]
- ^ The Plant List: A Working List of All Plant Species, retrieved 26 March 2016
- ^ Dianxiang Zhang & David J. Mabberley, "Citrus Linnaeus, Sp. Pl. 2: 782. 1753", Flora of China online, vol. 11
- ^ Dianxiang Zhang & David J. Mabberley, "Citrus trifoliata Linnaeus, Sp. Pl., ed. 2. 2: 1101. 1763", Flora of China online, vol. 11
- ^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
- ^ USDA, NRCS (n.d.). "Poncirus trifoliata". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 31 January 2016.
- ^ "Notice to Fruit Growers and Nurseymen Related to the Naming and Release of the US-942 Citrus Rootstock" (PDF). Agricultural Research Service, USDA. 22 October 2010. pp. 1–2. Retrieved 23 October 2017.