Kumquat

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Kumquat
Kumquat.jpeg
Malayan kumquat foliage and fruit
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Sapindales
Family: Rutaceae
Subfamily: Aurantioideae
Tribe: Citreae
Genus: Citrus
Species: C. japonica
Binomial name
Citrus japonica
Thunb.
Synonyms[1]
  • Atalantia hindsii (Champ. ex Benth.) Oliv.
  • Citrus erythrocarpa Hayata
  • Citrus hindsii (Champ. ex Benth.) Govaerts
  • Citrus inermis Roxb.
  • Citrus kinokuni Yu.Tanaka
  • Citrus madurensis Lour.
  • Citrus margarita Lour.
  • Citrus microcarpa Bunge
  • Fortunella bawangica C.C.Huang
  • Fortunella chintou (Swingle) C.C. Huang
  • Fortunella crassifolia Swingle
  • Fortunella hindsii (Champ. ex Benth.) Swingle
  • Fortunella japonica (Thunb.) Swingle
  • Fortunella margarita (Lour.) Swingle
  • Fortunella obovata Tanaka
  • Sclerostylis hindsii Champ. ex Benth.
  • Sclerostylis venosa Champ. ex Benth.
  • × Citrofortunella madurensis (Lour.) D.Rivera & al.
Kumquat
Chinese name
Chinese 金橘
Literal meaning golden orange
Alternative Chinese name
Chinese 柑橘
Literal meaning little tangerine orange
Vietnamese name
Vietnamese kim quất
Thai name
Thai ส้มจี๊ด
RTGS somchíd
Korean name
Hangul 금귤
Hanja 金橘
Japanese name
Kanji 金柑
Nepali name
Nepali muntala
Kumquats, raw
Fortunella spp.
Nutritional value per 100 g (3.5 oz)
Energy 296 kJ (71 kcal)
15.9 g
Sugars 9.36 g
Dietary fiber 6.5 g
0.86 g
1.88 g
Vitamins
Vitamin A equiv.
(2%)
15 μg
129 μg
Thiamine (B1)
(3%)
0.037 mg
Riboflavin (B2)
(8%)
0.09 mg
Niacin (B3)
(3%)
0.429 mg
(4%)
0.208 mg
Vitamin B6
(3%)
0.036 mg
Folate (B9)
(4%)
17 μg
Choline
(2%)
8.4 mg
Vitamin C
(53%)
43.9 mg
Vitamin E
(1%)
0.15 mg
Trace metals
Calcium
(6%)
62 mg
Iron
(7%)
0.86 mg
Magnesium
(6%)
20 mg
Manganese
(6%)
0.135 mg
Phosphorus
(3%)
19 mg
Potassium
(4%)
186 mg
Sodium
(1%)
10 mg
Zinc
(2%)
0.17 mg

Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

Kumquats or cumquats (UK /ˈkʌmkwɒt/;[2] US /ˈkʌmˌkwɑːt/ or /ˈkʌmkwɔːt/[3]) are a group of small fruit-bearing trees in the flowering plant family Rutaceae, either forming the genus Fortunella, or placed within Citrus sensu lato. The edible fruit closely resembles that of the orange (Citrus sinensis), but it is much smaller, being approximately the size and shape of a large olive. Kumquat is a fairly cold hardy citrus.

Name[edit]

The English name "kumquat" derives from the Cantonese pronunciation gam1 gwat1 (given in Jyutping romanization).

Origin[edit]

The plant is native to south Asia and the Asia-Pacific region. The earliest historical reference to kumquats appears in literature of China in the 12th century. They have long been cultivated in India, Japan, Taiwan, the Philippines, and southeast Asia. They were introduced to Europe in 1846 by Robert Fortune, collector for the London Horticultural Society, and shortly thereafter into North America.

Description[edit]

Illustration by Walter Hood Fitch.

They are slow-growing evergreen shrubs or short trees, from 2.5 to 4.5 meters (8 to 15 ft) tall, with dense branches, sometimes bearing small thorns. The leaves are dark glossy green, and the flowers are white, similar to other citrus flowers, borne singly or clustered in the leaf-axils. Depending on size, the kumquat tree can produce hundreds or even thousands of fruits each year.[4] The tree can be hydrophytic, grown in water, with the fruit often found floating on water near shore during the ripe season.[citation needed]

Varieties[edit]

Round kumquat[edit]

When the kumquats are divided into multiple species, the name Fortunella japonica (or Citrus japonica) is retained by this group. The round kumquat also called Marumi kumquat or Morgani kumquat, is an evergreen tree, producing edible golden-yellow fruit. The round Hawaiian varietal, the "Meiwa kumquat", is eaten raw. The fruit is small and usually round but can be oval shaped. The peel has a sweet flavor but the fruit has a sour center. The fruit can be eaten cooked but is mainly used to make marmalades and jellies. It is grown as an ornamental plant and can be used in bonsai. The plant symbolizes good luck in China and other Asian countries, where it is kept as a houseplant and given as a gift during the Lunar New Year. Round kumquats are more commonly cultivated than other species due to their cold tolerance.

Oval kumquat[edit]

When the kumquats are divided into multiple species, the name Fortunella margarita (or Citrus margarita) is used for this group. The oval kumquat is also called the Nagami kumquat.[5] The unusual feature of the Nagami cumquat is in the eating of the fruit. The fruit is eaten whole, skin and all. The inside is still quite sour, but the skin has the sweeter flavour, when eaten together it produces an unusual refreshing flavour. Fruit ripens mid to late winter and always crops very heavily, making a spectacular display against the dark green foliage. The tree is smaller growing and dwarf in nature, making it ideal for pots and has even been used in bonsai.

Jiangsu kumquat[edit]

When the kumquats are divided into multiple species the name Fortunella obovata (or Citrus obovata) is used for this group. The Jiangsu kumquat or Fukushu kumquat bears edible fruit that can be eaten raw. The fruit can be made into jelly and marmalade. The fruit can be round or bell shaped; it is bright orange when fully ripe. It may be distinguished from other kumquats by its round leaves. It is grown for its edible fruit and as an ornamental plant. It cannot withstand frost.

'Centennial Variegated' kumquat[edit]

'Centennial Variegated' kumquat tree.
'Centennial Variegated' kumquat fruit.

The 'Centennial Variegated' kumquat cultivar arose spontaneously from the Nagami kumquat. It produces a greater portion of fruit versus the thinner peel than the Nagami kumquat, and the fruit are also rounder and sometimes necked. Fruit are distinguishable by their variegation in color of green and yellow stripes. The tree is thornless.[6]

Cultivation and uses[edit]

Kumquats are cultivated in China, South Korea, North Korea, Taiwan, Southeast Asia, Nepal, Japan, the Middle East, Iran, Europe (notably Corfu, Greece), southern Pakistan, and the southern United States (notably Florida, Louisiana, Alabama) and California.

They are much hardier than other citrus plants such as oranges. The 'Nagami' kumquat requires a hot summer, ranging from 25 °C to 38 °C (77 °F to 100 °F), but can withstand frost down to about −10 °C (14 °F) without injury. They grow in the tea hills of Hunan, China, where the climate is too cold for other citrus fruits, even the Mikan (also known as the Satsuma) orange. The trees differ also from other citrus species in that they enter into a period of winter dormancy so profound that they will remain in it through several weeks of subsequent warm weather without putting out new shoots or blossoms. Despite their ability to survive low temperatures, kumquat trees grow better and produce larger and sweeter fruits in warmer regions.

Kumquats do not grow well from seeds and so are vegetatively propagated, using rootstock of another citrus fruit.[7]

Uses[edit]

Culinary uses include candying and kumquat preserves, marmalade, and jelly. Kumquats can also be sliced and added to salads. In recent years kumquats have gained popularity as a garnish for cocktail beverages, including the martini as a replacement for the more familiar olive. A kumquat liqueur mixes the fruit with vodka or other clear spirit. Kumquats are also being used by chefs to create a niche for their desserts[clarification needed] and are common in European countries.[citation needed]

The Cantonese often preserve kumquats in salt or sugar.[citation needed] A batch of the fruit is buried in dry salt inside a glass jar. Over time, all the juice from the fruit is diffused into the salt. The fruit in the jar becomes shrunken, wrinkled, and dark brown in color, and the salt combines with the juice to become a dark brown brine. A few salted kumquats with a few teaspoons of the brine/juice may be mixed with hot water to make a remedy for sore throats.[citation needed]A jar of such preserved kumquats can last several years and still keep its flavor.[citation needed]

In the Philippines and Taiwan, kumquats are a popular addition to green tea and black tea, either hot or iced.[citation needed]

In Vietnam, kumquat bonsai trees (round kumquat plant) are used as a decoration for the Tết (Lunar New Year) holiday. Kumquat fruits are also boiled or dried to make a candied snack called mứt quất.[citation needed]

Variants of the kumquat are grown specially in India.

The kumquat is celebrated annually in Dade City, Florida, U.S.A. with the annual Kumquat Festival.

Composition[edit]

The essential oil of kumquat peel contains much of the aroma of the fruit, and is composed principally of limonene, which makes up around 93% of the total.[8] Besides limonene and alpha-pinene (0.34%), both monoterpenes, the oil is unusually rich (0.38% total) in sesquiterpenes such as α-bergamotene (0.021%), caryophyllene (0.18%), α-humulene (0.07%) and α-muurolene (0.06%), and these contribute to the spicy and woody flavor of the fruit. Carbonyl compounds make up much of the remainder, and these are responsible for much of the distinctive flavor. These compounds include esters such as isopropyl propanoate (1.8%) and terpinyl acetate (1.26%); ketones such as carvone (0.175%); and a range of aldehydes such as citronellal (0.6%) and 2-methylundecanal. Other oxygenated compounds include nerol (0.22%) and trans-linalool oxide (0.15%).[8]

Hybrids[edit]

Hybrid forms of the kumquat include the following:

Though loquats are not botanically related to kumquats, the terms originate in the same Chinese word designating "orange".

References[edit]

  1. ^ "The Plant List: A Working List of All Plant Species". Retrieved 28 July 2014. 
  2. ^ "Britain: Kumquat". Collins Dictionary. n.d. Retrieved 25 September 2014. 
  3. ^ "American: Kumquat". Collins Dictionary. n.d. Retrieved 25 September 2014. 
  4. ^ Morton, Julia (1987). "Kumquat". Fruits of warm climates. Miami, FL. pp. 182–185. A mature specimen on rough lemon rootstock at Oneco, Florida, in 1901, bore a crop of 3,000 to 3,500 fruits. 
  5. ^ Fortunella margarita: oval kumquat, Nagami kumquat, coolexotics.com
  6. ^ Centennial at the Citrus Variety Collection
  7. ^ http://www.hort.purdue.edu/newcrop/morton/kumquat.html
  8. ^ a b Koyasako, A, A.; Bernhard, R.A. (1983). "Volatile Constituents of the Essential Oil of Kumquat". Journal of Food Science (Wiley & Sons) 48 (6): 1807–1812. doi:10.1111/j.1365-2621.1983.tb05090.x. 
  9. ^ "USDA GRIN Taxonomy". Retrieved 1 June 2014. 

Further reading[edit]