Tag: DNA

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Botanical Name: Taraxacum officinale (WEBER)
Family: Asteraceae
Kingdom:Plantae
Order: Asterales
Tribe: Cichorieae
Genus: Taraxacum

Common Names: The common name dandelion ( dan-di-ly-?n, from French dent-de-lion, meaning “lion’s tooth”) is given to members of the genus and, like other members of the Asteraceae family, they have very small flowers collected together into a composite flower head. Each single flower in a head is called a floret. Many Taraxacum species produce seeds asexually by apomixis, where the seeds are produced without pollination, resulting in offspring that are genetically identical to the parent plant

Habitat  : Dandelion is    native to temperate areas of the globe. Throughout most of the northern hemisphere, including Britain.  A very common weed of grassland and cultivated ground.

A dandelion is a short plant, usually with a yellow flower head and notched leaves. A dandelion flower head consists of many tiny flowers. The dandelion is native to Europe and Asia, and has spread to many other places. The dandelion is also known by its genera name Taraxacum. In Northern areas and places where the dandelion is not native, it reproduces asexually.

The Dandelion, though not occurring in the Southern Hemisphere, is at home in all parts of the north temperate zone, in pastures, meadows and on waste ground, and is so plentiful that farmers everywhere find it a troublesome weed, for though its flowers are more conspicuous in the earlier months of the summer, it may be found in bloom, and consequently also prolifically dispersing its seeds, almost throughout the year.

Plant Description:
Dandelion (Taraxacum) is a large genus of flowering plants in the family Asteraceae. They are tap-rooted biennial or perennial herbaceous plants, native to temperate areas of the Northern Hemisphere of the Old World. They are known as pests or weeds to the common person.

The genus is taxonomically very complex, with numerous macrospecies, and polyploidy is also common; over 250 species have been recorded in the British Isles alone (Richards 1972). Some botanists take a much narrower viewpoint, and only accept a total of about 60 species.

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The leaves are 5-25 cm long, simple and basal, entire or lobed, forming a rosette above the central taproot. As the leaves grow outward they push down the surrounding vegetation, such as grass in a lawn, killing the vegetation by cutting off the sunlight. A bright yellow flower head (which is open in the daytime but closes at night) is borne singly on a hollow stem (scape) which rises 4-30 cm above the leaves and exudes a milky sap (latex) when broken. A rosette may produce several flowering stems at a time. The flower head is 2-5 cm in diameter and consists entirely of ray florets.

Away from their native regions, they have become established in the Americas, Australia and New Zealand as weeds. They are now common plants throughout all temperate regions.

—From its thick tap root, dark brown, almost black on the outside though white and milky within, the long jagged leaves rise directly, radiating from it to form a rosette Iying close upon the ground, each leaf being grooved and constructed so that all the rain falling on it is conducted straight to the centre of the rosette and thus to the root which is, therefore, always kept well watered. The maximum amount of water is in this manner directed towards the proper region for utilization by the root, which but for this arrangement would not obtain sufficient moisture, the leaves being spread too close to the ground for the water to penetrate.

The leaves are shiny and without hairs, the margin of each leaf cut into great jagged teeth, either upright or pointing somewhat backwards, and these teeth are themselves cut here and there into lesser teeth. It is this somewhat fanciful resemblance to the canine teeth of a lion that (it is generally assumed) gives the plant its most familiar name of Dandelion, which is a corruption of the French Dent de Lion, an equivalent of this name being found not only in its former specific Latin name Dens leonis and in the Greek name for the genus to which Linnaeus assigned it, Leontodon, but also in nearly all the languages of Europe.

There are many varieties of Dandelion leaves; some are deeply cut into segments, in others the segments or lobes form a much less conspicuous feature, and are sometimes almost entire.
The shining, purplish flower-stalks rise straight from the root, are leafless, smooth and hollow and bear single heads of flowers. On picking the flowers, a bitter, milky juice exudes from the broken edges of the stem, which is present throughout the plant, and which when it comes into contact with the hand, turns to a brown stain that is rather difficult to remove.

Flower Forms Dandelion clock :
The flower matures into a globe of fine filaments that are usually distributed by wind, carrying away the seed-containing achenes. This globe (receptacle) is called the “dandelion clock,” and blowing it apart is a popular activity for children worldwide. In German it’s called a Pusteblume, translated as “blow flower.” The number of blows required to completely rid the clock of its seeds is deemed to be dependent on the time of day.

Seeds:
The flower head is surrounded by bracts (sometimes mistakenly called sepals) in two series. The inner bracts are erect until the seeds mature, then flex down to allow the seeds to disperse; the outer bracts are always reflexed downward. Some species drop the “parachute” (called a pappus, modified sepals) from the achenes. Between the pappus and the achene, there is a stalk called a beak, which elongates as the fruit matures. The beak breaks off from the achene quite easily.

General Uses:
Dandelions are used as food plants by the larvae of some species of Lepidoptera.Small birds are very fond of the seeds of the Dandelion and pigs devour the whole plant greedily. Goats will eat it, but sheep and cattle do not care for it, though it is said to increase the milk of cows when eaten by them. Horses refuse to touch this plant, not appreciating its bitter juice. It is valuable food for rabbits and may be given them from April to September forming excellent food in spring and at breeding seasons in particular.

The young leaves of the Dandelion make an agreeable and wholesome addition to spring salads and are often eaten on the Continent, especially in France. The full-grown leaves should not be taken, being too bitter, but the young leaves, especially if blanched, make an excellent salad, either alone or in combination with other plants, lettuce, shallot tops or chives.

Young Dandelion leaves make delicious sandwiches, the tender leaves being laid between slices of bread and butter and sprinkled with salt. The addition of a little lemon-juice and pepper varies the flavour. The leaves should always be torn to pieces, rather than cut, in order to keep the flavour.

The young leaves may also be boiled as a vegetable, spinach fashion, thoroughly drained, sprinkled with pepper and salt, moistened with soup or butter and served very hot. If considered a little too bitter, use half spinach, but the Dandelion must be partly cooked first in this case, as it takes longer than spinach. As a variation, some grated nutmeg or garlic, a teaspoonful of chopped onion or grated lemon peel can be added to the greens when they are cooked. A simple vegetable soup may also be made with Dandelions.

The dried Dandelion leaves are also employed as an ingredient in many digestive or diet drinks and herb beers. Dandelion Beer is a rustic fermented drink common in many parts of the country and made also in Canada. Workmen in the furnaces and potteries of the industrial towns of the Midlands have frequent resource to many of the tonic Herb Beers, finding them cheaper and less intoxicating than ordinary beer, and Dandelion stout ranks as a favourite. An agreeable and wholesome fermented drink is made from Dandelions, Nettles and Yellow Dock.

The roasted roots are largely used to form Dandelion Coffee, being first thoroughly cleaned, then dried by artificial heat, and slightly roasted till they are the tint of coffee, when they are ground ready for use. The roots are taken up in the autumn, being then most fitted for this purpose. The prepared powder is said to be almost indistinguishable from real coffee, and is claimed to be an improvement to inferior coffee, which is often an adulterated product. Of late years, Dandelion Coffee has come more into use in this country, being obtainable at most vegetarian restaurants and stores. Formerly it used occasionally to be given for medicinal purposes, generally mixed with true coffee to give it a better flavour. The ground root was sometimes mixed with chocolate for a similar purpose. Dandelion Coffee is a natural beverage without any of the injurious effects that ordinary tea and coffee have on the nerves and digestive organs. It exercises a stimulating influence over the whole system, helping the liver and kidneys to do their work and keeping the bowels in a healthy condition, so that it offers great advantages to dyspeptics and does not cause wakefulness.

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.

Patrs Used In Medicine:—The root, fresh and dried, the young tops. All parts of the plant contain a somewhat bitter, milky juice (latex), but the juice of the root being still more powerful is the part of the plant most used for medicinal purposes.

Medicinal   Uses:-Diuretic, tonic and slightly aperient. It is a general stimulant to the system, but especially to the urinary organs, and is chiefly used in kidney and liver disorders.

Dandelion is not only official but is used in many patent medicines. Not being poisonous, quite big doses of its preparations may be taken. Its beneficial action is best obtained when combined with other agents.

The tincture made from the tops may be taken in doses of 10 to 15 drops in a spoonful of water, three times daily.

It is said that its use for liver complaints was assigned to the plant largely on the doctrine of signatures, because of its bright yellow flowers of a bilious hue.

In the hepatic complaints of persons long resident in warm climates, Dandelion is said to afford very marked relief. A broth of Dandelion roots, sliced and stewed in boiling water with some leaves of Sorrel and the yolk of an egg, taken daily for some months, has been known to cure seemingly intractable cases of chronic liver congestion.

A strong decoction is found serviceable in stone and gravel: the decoction may be made by boiling 1 pint of the sliced root in 20 parts of water for 15 minutes, straining this when cold and sweetening with brown sugar or honey. A small teacupful may be taken once or twice a day.

Dandelion is used as a bitter tonic in atonic dyspepsia, and as a mild laxative in habitual constipation. When the stomach is irritated and where active treatment would be injurious, the decoction or extract of Dandelion administered three or four times a day, will often prove a valuable remedy. It has a good effect in increasing the appetite and promoting digestion.

Dandelion combined with other active remedies has been used in cases of dropsy and for induration of the liver, and also on the Continent for phthisis and some cutaneous diseases. A decoction of 2 OZ. of the herb or root in 1 quart of water, boiled down to a pint, is taken in doses of one wineglassful every three hours for scurvy, scrofula, eczema and all eruptions on the surface of the body.

Known Hazards : This plant has been mentioned in various books on poisonous plants but any possible toxins will be of very low concentration and toxicity. There are reports that some people have suffered dermatitis as a result of touching the plant, this is probably caused by the latex in the leaves and stems.

Disclaimer : The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplement, it is always advisable to consult with your own health care provider.

Help taken from :en.wikipedia.org, www. botanical.com and Herbs That Heals

http://www.herbnet.com/Herb%20Uses_DE.htm

http://www.pfaf.org/user/Plant.aspx?LatinName=Taraxacum+officinale

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