(Yu.Tanaka ex Swingle) [[.]]
Citrus unshiu is a semi-seedless and easy-peeling citrus species, also known as unshu mikan, cold hardy mandarin, satsuma mandarin, satsuma orange, naartjie, and tangerine. It is of Chinese origin, named after Unsyu (Wenzhou), China, but introduced to the West via Japan.
The unshiu is known as wēnzhōu mìgān (simplified Chinese: 温州蜜柑; traditional Chinese: 溫州蜜柑) in China, and mikan in Japan (or formally unshū mikan (温州蜜柑), the Japanese reading of the characters used in Chinese). In both languages, the name means "honey citrus of Wenzhou" (a city in Zhejiang province, China). An alternative Chinese name, Chinese: 无核桔; pinyin: wúhé jú, means "seedless mandarin".
One of the English names for the fruit, satsuma, is derived from the former Satsuma Province in Japan, from which these fruits were first exported to the West.
Under the Tanaka classification system, Citrus unshiu is considered a separate species from the mandarin. Under the Swingle system, unshius are considered to be a group of mandarin varieties. Genetic analysis has shown the Satsuma to be a highly inbred mandarin-pomelo hybrid, with 22% of its genome, a larger proportion than seen in most mandarins, coming from pomelo. It arose when a mandarin of the low-pomelo huanglingmiao/kishu variety (placed in C. reticulata by Tanaka) was crossed with a pomelo or pomelo hybrid, then the resulting cultivar was backcrossed with another huanglingmiao/kishu mandarin.
Its fruit is one of the sweetest citrus varieties. It is usually seedless, and is about the size of other mandarin oranges (Citrus reticulata). Satsumas are known for their loose, leathery skin; the fruit is very easily peeled in comparison to other citrus fruits.  The rind is often smooth to slightly rough with the shape of a medium to small flattened sphere. Satsumas usually have 10 to 12 easily separable segments with tough membranes. The flesh is particularly delicate, and cannot withstand the effects of careless handling. Coloring of the fruit is often dependent on climate; Satsumas grown in humid areas may be ripe while the skin is still green while those grown in areas with cool night temperatures may see a brilliant reddish orange skin at peak.
Satsumas are cold-hardy, and when planted in colder locations, the fruit becomes sweeter from the colder temperatures. A mature satsuma tree can survive down to −9 °C (15 °F) or even −11 °C (12 °F) for a few hours. Of the edible citrus varieties, only the kumquat is more cold-hardy. Satsumas rarely have any thorns, an attribute that also makes them popular. They can be grown from seed, which takes about 8 years until the first fruits are produced, or grafted onto other citrus rootstocks, such as trifoliate orange.
Jesuits brought the fruit from Asia to North America in the 18th century, starting groves in the Jesuit Plantation upriver from New Orleans, Louisiana (then a part of New Spain). The municipal street "Orange" in New Orleans, was originally named "Rue Des Orangers" and the site of the Jesuit grove. The groves were later re-cultivated farther south in Plaquemines Parish to provide greater protection from harmful frosts, and have continued to the present day. The Becnel family are the largest growers of Louisiana Citrus.
The fruit became much more common in the United States starting in the late 19th century. In 1878 during the Meiji period, Owari mikans were brought to the United States from the Satsuma Province in Kyūshū, Japan, by the spouse of the US Minister to Japan, General Van Valkenberg, who renamed them satsumas. Between 1908 and 1911 about a million Owari mikan trees were imported throughout the lower Gulf Coast states. Owari is still commonly grown in Florida. The towns of Satsuma, Alabama; Satsuma, Florida; Satsuma, Texas; and Satsuma, Louisiana were named after this fruit. By 1920 Jackson County in the Florida Panhandle had billed itself as the "Satsuma Capital of the World." However, the commercial industry was damaged by a −13.3 °C (8.1 °F) cold snap in 1911, a hurricane in 1915, and a very cold period in the late 1930s.
- Amanatsu (pumello hybrid)
- Kinkoji unshiu (C. obovoidea(kinkoji) × C. unshiu)
- Dekopon is a kiyomi hybrid
- Kobayashi mikan (C. natsudaidai × C.unshiu)
- Shonan Gold
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It's named after, Unsyu, China; in Japan it is known as "unshu mikan," in China, as "wenzhou migan"; recorded cultivation of the "wenzhou migan" date back some 2,400 years; it was listed as a tribute item for Imperial consumption in the TANG Dynasty; the best record of the cultivation of this variety in ancient China is from Jijia Julu, written by Han YAN, the governor of the region and published in 1178
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Mikan is a tangerine-like citrus fruit that is grown in warmer regions of Japan in large quantities. Many different varieties have been introduced to Japan from China since the eighth century, but since the late 19th century the most important variety has been the unshu.
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(After the many years of research, Dr. Tanaka has concluded the place of origin of Satsuma is Nagashima, Kagoshima. Satsuma is a chance seedling of Sōkitsu, Mankitsu, or Tendaisankitsu introduced from Huangyan Zhejiang, China. It appeared in the early Edo period.)
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