出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/06 13:05:51」(JST)
| Cinnamomum camphora | |
|---|---|
| An ancient camphor tree (estimated to be over 1,000 years old) in Japan | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Magnoliids |
| Order: | Laurales |
| Family: | Lauraceae |
| Genus: | Cinnamomum |
| Species: | Cinnamomum camphora |
| Binomial name | |
| Cinnamomum camphora (L.) J.Presl. |
|
Cinnamomum camphora (commonly known as camphor tree, camphorwood or camphor laurel) is a large evergreen tree that grows up to 20–30 m (66–98 ft) tall.[1] The leaves have a glossy, waxy appearance and smell of camphor when crushed. In spring, it produces bright green foliage with masses of small white flowers. It produces clusters of black berry-like fruit around 1 cm (0.39 in) in diameter. Its pale bark is very rough and fissured vertically.
Cinnamomum camphora is native to China south of the Yangtze River, Taiwan, southern Japan, Korea, and Vietnam, and has been introduced to many other countries.[1]
In Japan, five camphor trees are known with a trunk circumference above 20 m, with the largest tree (Kamou no Ohkusu) reaching the circumference of 24.22 m.[2]
Camphor laurel contains volatile chemical compounds in all plant parts, and the wood and leaves are steam distilled for the essential oils. Camphor laurel has six different chemical variants called chemotypes, which are camphor, linalool, 1,8-cineole, nerolidol, safrole, or borneol. In China, field workers avoid mixing chemotypes when harvesting by their odour.[3][4] The cineole fraction of camphor laurel is used in China to manufacture fake "Eucalyptus oil".[5]
The chemical variants (or chemotypes) seem dependent upon the country of origin of the tree. The tree is native to China, Japan, and Taiwan. It has been introduced to the other countries where it has been found, and the chemical variants are identifiable by country. e.g., C. camphora grown in Taiwan and Japan is normally very high in linalool, often between 80 and 85%. In India and Sri Lanka, the high camphor variety/chemotype remains dominant. C. camphora grown in Madagascar, though, is high in 1,8 cineole (averaging between 40 and 50%). The essential oil from the Madagascar trees is commercially known as ravintsara.[6]
Camphor is a white crystalline substance, obtained from the tree C. camphora. Camphor has been used for many centuries as a culinary spice, a component of incense, and as a medicine. It is also an insect repellent and a flea-killing substance.
C. camphora is native to Korea Jeju, Taiwan, southern Japan, southeast China, and Indochina, where it is also cultivated for camphor and timber production. The production and shipment of camphor, in a solid, waxy form, was a major industry in Taiwan prior to and during the Japanese colonial era (1895–1945). It was used medicinally and was also an important ingredient in the production of smokeless gunpowder and celluloid. Primitive stills were set up in the mountainous areas in which the tree is usually found. The wood was chipped; these chips were steamed in a retort, allowing the camphor to crystallize on the inside of a crystallization box, after the vapour had passed through a cooling chamber. It was then scraped off and packed out to government-run factories for processing and sale. Camphor was one of the most lucrative of several important government monopolies under the Japanese.
Camphor laurel was introduced to Australia in 1822 as an ornamental tree for use in gardens and public parks. It has become a noxious weed throughout Queensland and central to northern New South Wales, where it is suited to the wet, subtropical climate. However, the tree provides hollows quickly in younger trees, whereas natives can take hundreds of years to develop hollows.[7] Its massive and spreading root systems disrupt urban drainage and sewer systems and degrade river banks. Its leaves have a very high carbon content, which damages water quality and freshwater fish habitats when they fall into streams and rivers. The camphor content of the leaf litter helps prevent other plants from germinating successfully, helping to ensure the camphor's success against any potentially competing vegetation, and the seeds are attractive to birds and pass intact through the digestive system, ensuring rapid distribution. Camphor laurel invades rainforests and pastures, and also competes against eucalyptus trees, certain species of which are the sole food source of koalas.
Introduced to the contiguous United States around 1875, C. camphora has become naturalized in portions of Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, North Carolina, Texas, and South Carolina.[8] It has been declared a category I invasive species in Florida.[9]
In Australia, two native Lepidoptera insects, the purple brown-eye and common red-eye, larval stages feed on camphor despite it being an introduced plant.[10]
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| リンク元 | 「クスノキ」「Lauraceae」 |
| 関連記事 | 「Cinnamomum」「camphor」「camphora」 |