玉桂是甚麼?

肉桂為樟科常綠喬木，又名玉桂、牡桂，高達10米以上，樹皮灰褐色，樹皮厚可達13毫米，具強裂辛辣芳香味。葉互生或近對生；長橢圓形，或橢圓披針形，長8-20厘米，寬3-5.5厘米；頂端急尖，葉基寬楔形；全緣，具離基三出脈。圓錐花序頂生或腋生；花小，徑5毫米，花被裂片橢圓形，長3毫米。果橢圓形，長10毫米，徑7-8毫米，熟時紫黑色。


植物各部，如其樹皮、枝、葉、果、花梗都可提取芳香油或桂油，用於食品、飲料、香煙及醫藥，但常用作香料、化妝品、日用品的香精。樹皮出油率為2.15%，桂枝出油率為0.35%，桂葉出油率為0.39%，桂子(幼果)出油率為2.04%。各部位又可分別用於醫藥，樹皮也就是人們常說的桂皮，為中國傳統名貴中藥材，也作調味品，有驅風健胃、活血祛瘀、散寒止痛之效；樹枝則能發汗驅風，通經脈。


肉桂原產中國，分佈於廣西、廣東、福建、臺灣、雲南等濕熱地區，其中尤以廣西最多。越南、寮國、印度尼西亞等地亦有分佈。肉桂大多為人工栽培，且以種子繁殖為主，這樣可使其後代保持親本的特性，以獲得枝下較高的樹幹，有利於剝取桂皮，因此在生產上很少用無性繁殖方法培育苗木種植。多於秋季剝取，颳去栓皮、陰乾。因剝取部位及品質的不同而加工成多種規格，常見的有企邊桂、板桂、油板桂、桂通等。生用。


Cinnamon (Cinnamomum verum, synonym C. zeylanicum) is a small evergreen tree 10-15 meters (32.8-49.2 feet) tall, belonging to the family Lauraceae, native to Sri Lanka and Southern India. The bark is widely used as a spice. The leaves are ovate-oblong in shape, 7-18 cm (2.75-7.1 inches) long. The flowers, which are arranged in panicles, have a greenish color, and have a distinct odor. The fruit is a purple one-centimetre berry containing a single seed.

Its flavour is due to an aromatic essential oil which makes up 0.5 to 1% of its composition. This oil is prepared by roughly pounding the bark, macerating it in sea-water, and then quickly distilling the whole. It is of a golden-yellow colour, with the characteristic odour of cinnamon and a very hot aromatic taste. The pungent taste and scent come from cinnamic aldehyde or cinnamaldehyde and, by the absorption of oxygen as it ages, it darkens in colour and develops resinous compounds. Chemical components of the essential oil include ethyl cinnamate, eugenol, cinnamaldehyde, beta-caryophyllene, linalool and methyl chavicol.

The name cinnamon comes from Greek kinnámōmon, from Phoenician and akin to Hebrew qinnâmôn, itself ultimately from a Malaysian language, cf. Malay and Indonesian kayu manis which means sweet wood.

it's cinnamon. a kind of spice. the stuff you use for things like apple pie