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Poncirus

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Title: Poncirus  
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Subject: Citrus, Calamondin, Shrub, Donald E. Davis Arboretum, Arboretum of the Barnes Foundation, Papilio aegeus, Aurantioideae
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Poncirus

Trifoliate Orange
Poncirus trifoliata
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Sapindales
Family: Rutaceae
Subfamily: Aurantioideae
Tribe: Citreae
Genus: Poncirus (disputed)
Raf.
Species: P. trifoliata
Binomial name
Poncirus trifoliata
(L.) Raf.
Synonyms

Citrus trifoliata (L.)

Trifoliate Orange, Poncirus trifoliata (syn. Citrus trifoliata), is a member of the family Rutaceae, closely related to Citrus, and sometimes included in that genus, being sufficiently closely related to allow it to be used as a rootstock for Citrus. It differs from Citrus in having deciduous, compound leaves, and pubescent (downy) fruit.

It is native to northern China and Korea, and is also known as the Chinese Bitter Orange.[1]

The plant is fairly hardy (USDA zone 5) and will tolerate moderate frost and snow, making a large shrub or small tree 4–8 m tall. Because of the relative hardiness of Poncirus, citrus grafted onto it are usually hardier than when grown on their own roots.

Description

Poncirus trifoliata is recognisable by the large 3–5 cm thorns on the shoots, and its deciduous leaves with three (or rarely, five) leaflets, typically with the middle leaflet 3–5 cm long, and the two side leaflets 2–3 cm long. The flowers are white, with pink stamens, 3–5 cm in diameter, larger than those of true citrus but otherwise closely resembling them, except that the scent is much less pronounced than with true citrus. As with true citrus, the leaves give off a spicy smell when crushed.

The fruits are green, ripening to yellow, and 3–4 cm in diameter, resembling a small orange, but with a finely downy surface. They are very bitter, are not edible fresh, but can be made into marmalade, and when dried and powdered, they can be used as a condiment.


Uses

Cultivation

The cultivar "Flying Dragon" is dwarfed in size and has highly twisted, contorted stems. It makes an excellent barrier hedge due to its density and thorns. Such a hedge had been grown for over 50 years at Oklahoma State University in Stillwater.[1]

Medicine

Traditional medicine

The fruits of Poncirus trifoliata are widely used in Oriental medicine as a remedy for allergic inflammation.[2]

Potential pharmacology

In vitro studies show that extracts of the fruits of Poncirus trifoliata inhibit NF-κB activation in mast cells.[3] The chemical compounds neohesperidin and poncirin isolated from Poncirus trifoliata may be useful for the treatment of, and protection from, gastritis.[4] Poncirus trifoliata extracts have been shown to possess in vitro anti-allergic, antitumor,[5][6] anti-inflammatory and antiviral activities.[7] Poncirus trifoliata extract could possess a wide range of beneficial activities for neurodegenerative disorders.[8] A water extract, taken for 10 weeks, suppressed weight gain in rats.[9]

See also

References

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