by justfun » 30 Apr 2009
Cây này được liệt vào hàng " Cỏ dại " và mọc hoang khắp nơi. Người ta đã tốn rất nhiều tiền để diệt chúng.
Huyền thoại tên của chúng :
The French name for Dandelion (Taraxacum officinale, Weber, T. Densleonis, Desf; Leontodon taraxacum, Linn.) really surprised me, though: Pissenlit. How do you pronounce that? And how weird is it that the French word for dandelion sounds like "piss"?
Well, it's not so weird after all, since piss in French actually means pretty much the same as it does in English, and the whole word translates as "piss in bed". Turns out that an old English name for the dandelion was also "piss-a-bed." Both piss names come from its use as an herbal diuretic. Other more poetic old common names include blowball, peasant's clock, tell-time, lion's tooth, and swine's snout.
There's a lot of interesting folklore about dandelions (linked to many of the common names above). I haven't been able to convince my kids to eat the young leaves in a salad yet, but maybe next spring.
Meanwhile, if you ever want to know the word origins of pissant, piss elm (Chinese elm), and why it was ok for them to say "pisspot" but not "take a piss" on the Waltons, I recommend a search through the archives of the American Dialect Society's mailing list here. It's kind of cool that it is administered by the Linguist List of EMU and Wayne State. I had no idea such a thing existed.
....
Dược tính của chúng :
Chemical Constituents---The chief constituents of Dandelion root are Taraxacin, acrystalline, bitter substance, of which the yield varies in roots collected at different seasons, and Taraxacerin, an acrid resin, with Inulin (a sort of sugar which replaces starch in many of the Dandelion family, Compositae), gluten, gum and potash. The root contains no starch, but early in the year contains much uncrystallizable sugar and laevulin, which differs from Inulin in being soluble in cold water. This diminishes in quantity during the summer and becomes Inulin in the autumn. The root may contain as much as 24 per cent. In the fresh root, the Inulin is present in the cell-sap, but in the dry root it occurs as an amorphodus, transparent solid, which is only slightly soluble in cold water, but soluble in hot water.
There is a difference of opinion as to the best time for collecting the roots. The British Pharmacopceia considers the autumn dug root more bitter than the spring root, and that as it contains about 25 per cent insoluble Inulin, it is to be preferred on this account to the spring root, and it is, therefore, directed that in England the root should be collected between September and February, it being considered to be in perfection for Extract making in the month of November.
Bentley, on the other hand, contended that it is more bitter in March and most of all in July, but that as in the latter month it would generally be inconvenient for digging it, it should be dug in the spring, when the yield of Taraxacin, the bitter soluble principle, is greatest.
On account of the variability of the constituents of the plant according to the time of year when gathered, the yield and composition of the extract are very variable. If gathered from roots collected in autumn, the resulting product yields a turbid solution with water; if from spring-collected roots, the aqueous solution will be clear and yield but very little sediment on standing, because of the conversion of the Inulin into Laevulose and sugar at this active period of the plant's life.
In former days, Dandelion Juice was the favourite preparation both in official and domestic medicine. Provincial druggists sent their collectors for the roots and expressed the juice while these were quite fresh. Many country druggists prided themselves on their Dandelion Juice. The most active preparations of Dandelion, the Juice (Succus Taraxaci) and the Extract (Extractum Taraxaci), are made from the bruised fresh root. The Extract prepared from the fresh root is sometimes almost devoid of bitterness. The dried root alone was official in the United States Pharmacopoeia.
The leaves are not often used, except for making Herb-Beer, but a medicinal tincture is sometimes made from the entire plant gathered in the early summer. It is made with proof spirit.
When collecting the seeds care should be taken when drying them in the sun, to cover them with coarse muslin, as otherwise the down will carry them away. They are best collected in the evening, towards sunset, or when the damp air has caused the heads to close up.
The tops should be cut on a dry day, when quite free of rain or dew, and all insect-eaten or stained leaves rejected.
Cách xử dụng chúng :
Dandelion Tea---
Infuse 1 OZ. of Dandelion in a pint of boiling water for 10 minutes; decant, sweeten with honey, and drink several glasses in the course of the day. The use of this tea is efficacious in bilious affections, and is also much approved of in the treatment of dropsy.
Or take 2 OZ. of freshly-sliced Dandelion root, and boil in 2 pints of water until it comes to 1 pint; then add 1 OZ. of compound tincture of Horseradish. Dose, from 2 to 4 OZ. Use in a sluggish state of the liver.
Or 1 OZ. Dandelion root, 1 OZ. Black Horehound herb, 1/2 OZ. Sweet Flag root, 1/4 OZ. Mountain Flax. Simmer the whole in 3 pints of water down to 1 1/2 pint, strain and take a wineglassful after meals for biliousness and dizziness.
---For Gall Stones---
1 OZ. Dandelion root, 1 OZ. Parsley root, 1 OZ. Balm herb, 1/2 OZ. Ginger root, 1/2 OZ. Liquorice root. Place in 2 quarts of water and gently simmer down to 1 quart, strain and take a wineglassful every two hours.
For a young child suffering from jaundice: 1 OZ. Dandelion root, 1/2 oz. Ginger root, 1/2 oz. Caraway seed, 1/2 oz. Cinnamon bark, 1/4 oz. Senna leaves. Gently boil in 3 pints of water down to 1 1/2 pint, strain, dissolve 1/2 lb. sugar in hot liquid, bring to a boil again, skim all impurities that come to the surface when clear, put on one side to cool, and give frequently in teaspoonful doses.
---A Liver and Kidney Mixture---
1 OZ. Broom tops, 1/2 oz. Juniper berries, 1/2 oz. Dandelion root, 1 1/2 pint water. Boil in gredients for 10 minutes, then strain and adda small quantity of cayenne. Dose, 1 tablespoonful, three times a day.
---A Medicine for Piles---
1 OZ. Long-leaved Plantain, 1 OZ. Dandelion root, 1/2 oz. Polypody root, 1 OZ. Shepherd's Purse. Add 3 pints of water, boil down to half the quantity, strain, and add 1 OZ. of tincture of Rhubarb. Dose, a wineglassful three times a day. Celandine ointment to be applied at same time.
In Derbyshire, the juice of the stalk is applied to remove warts.
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