|
|
|
|
Tansy
|
| |
|
| |
Tansy (Tanacetum vulgare) is a perennial herbaceous flowering plant of the aster family that is native to temperate Europe and Asia. It has been introduced to other parts of the world and in some cases has become invasive.
Discussion
Ask a question about 'Tansy' Start a new discussion about 'Tansy' Answer questions from other users |
Encyclopedia
Tansy (Tanacetum vulgare) is a perennial herbaceous flowering plant of the aster family that is native to temperate Europe and Asia. It has been introduced to other parts of the world and in some cases has become invasive. It is also known as Common Tansy, Bitter Buttons, Cow Bitter, Mugwort, or Golden Buttons.
Description
Tansy is a flowering herbaceous plant with finely divided compound leaves and yellow, buttonlike flowers. It has a stout, somewhat reddish, erect stem, usually smooth, 50-150 cm tall, and branching near the top. The leaves are alternate, 10-15 cm long and are pinnately lobed, divided almost to the center into about seven pairs of segments or lobes which are again divided into smaller lobes having saw-toothed edges, thus giving the leaf a somewhat fernlike appearance. The roundish, flat-topped, buttonlike, yellow flower heads are produced in terminal clusters from mid to late summer. The scent is similar to that of camphor with hints of rosemary. The leaves and flowers are said to be poisonous if consumed in large quantities. The plant's volatile oil is high in thujone, a substance found in absinthe that can cause convulsions. Some insects, notably the tansy beetle, have evolved resistance to tansy and live almost exclusively on it.
History and distribution
Tansy is native to Eurasia; it is found in almost all parts of mainland Europe. It is absent from Siberia and some of the Mediterranean islands. The ancient Greeks may have been the first to cultivate it as a medicinal herb. In about 1525, it was listed (by the spelling "Tansey") as "necessary for a garden" in Britain.
History of Uses
Common tansy has a long history of many uses. Tansy was first recorded cultivated by the ancient Greeks for a variety of medicinal purposes. In the eight century it was grown in the herb gardens of Charlemagne the Great and by Benedictine monks of the Swiss monastery of St. Gall. Tansy was considered a cure for intestinal worms, helped with rheumatism, digestive problems, fevers, used to heal sores, and “brought out” measles.
During the Middle Ages and later, high doses were used to induce abortions. Contradictorily, tansy was also used to help women conceive and to prevent miscarriages. In the 15th century Christians began serving tansy with the Lent meals to commemorate the bitter herbs eaten by the Israelites. Tansy was thought to have the added Lenten benefit of controlling flatulence brought on by days of eating fish, beans, and peas. Lenten tansy cakes were also superstitiously served to prevent the intestinal worms brought on by eating fish.
Common tansy was used as a face wash and was reported to lighten and purify the skin. In the 1800s Irish folklore suggested that bathing in a solution tansy and salts was the cure to joint pain. Although most of common tansy’s medicinal uses have been discredited, it is still a component of some medicines today and is listed by the United States Pharmacopeia as a treatment for fevers, feverish colds, and jaundice.
Common tansy has also been cultivated and used for its bug repellent and preservative effects. Common tansy and related species have been used for centuries as an insect and worm warding type of embalming. It was packed into coffins, wrapped in funeral winding sheets, and sometimes tansy wreaths placed on the dead. The first president of Harvard was laid to rest in 1668 wearing a tansy wreath in a coffin packed with tansy; when “God’s Acre” was exhumed and moved in 1846, the tansy had maintained its shape and fragrance helping to identify the president’s remains. By the 19th century the use of tansy at funerals was so prevalent in New England that people began to despise tansy for its mournful and morbid association with death.
During the American colonial period meat was frequently rubbed with or packed in common tansy to repel insects and prevent decay. Also during the colonial period common tansy was frequently worn in shoes to prevent ague and malaria. In England tansy was placed on window sills to repel flies, sprigs placed in bed linen to drive away pests, and was also used as an ant repellent ([21]) In the 1940s distilled common tansy oils mixed with fleabane, pennyroyal, and diluted alcohol was a well known mosquito repellent, with collectors paying five cents a pound for tansy in full bloom ([22]; [13]). Common tansy was planted along side potatoes to repel the Colorado potato bug, one study finding tansy reduced the potato bugs population by 60-100% ([19]; [13]; [11]). Research has found that tansy extracts do indeed repel mosquitoes, but not as effectively as products containing diethyltoluamide ([20]; [13]).
Toxicity
Tansy contains volatile oils which can cause contact dermatitis in sensitive individuals and, if taken internally, result in toxic by-products being produced in the liver and digestive tract as the plant's oils are broken down. Tansy is highly toxic to internal parasites, and has been used by herbalists to expel worms for centuries. Because tansy contains thujone, the U.S. FDA limits tansy use to alcoholic beverages, and the final product must be thujone-free. Tansy is an effective insecticide, and is highly toxic to arthropods.
The chemical compounds in common tansy’s volatile oils can be divided into four groups; 1,8-cineole, trans-thujone, camphor, and myrtenol, with the presents and amounts of each of these groups varying greatly from season to season and from one individual plant to the next ([20]; [13]; [25]; [24]; [23]). The 1,8-cineole compound is a toxin produced in the leaves of tansy believed to defend against herbivores ([24]; [23]).The 1,8-cineole compound has a long list of biological activities; allelopathy, anesthetic, antibacterial, carcinogenic, fungicide, herbicide, insectifuge, nematicide, sedative, testosterone hydroxylase inducer, and others ([20]; [13]; [24]; [23]). Thujone is a compound found in some alcoholic beverages, is a GABA receptor antagonist that allows neurons to fire more easily, and has reported effects of; being an aphrodisiac, increased brain activity, hallucinations, spasms, convulsions, and even death ([24]; [23]). Camphor is another compound with various uses; manufacture of plastics, used in lacquers and varnishes, in explosives and pyrotechnics, as a moth repellent, as a preservative in pharmaceuticals and cosmetics, medially used to relieve itching and pain creating a cooling effect on the skin, as an injectable antibacterial for root canals in dentistry, a food flavor enhancer, and is an active ingredient in Vicks VapoRub® ([24]; [23]). Finally, Myrtenol has been used as an insect pheromone in insect trapping, as a beverage preservative, a flavoring and a fragrance ([24]; [23]).
Culinary uses
Tansy was formerly used as a flavoring for puddings and omelets, but is almost unknown now. As noted by Gerarde, Tansy was well known as "pleasant in taste", and he recommends tansy sweetmeats as "an especial thing against the gout, if every day for a certain space a reasonable quantitie thereof be eaten fasting". In Yorkshire, tansy and caraway seeds were traditionally used in biscuits served at funerals. According to liquor historian A. J. Baime's book Big Shots, Tennessee whiskey magnate Jack Daniel enjoyed drinking his own whiskey with sugar and crushed tansy leaf.
Ethnomedical use
For many years, tansy has been used as a medicinal herb. Irish folklore of the mid-1800s suggests bathing in a solution of tansy and salt as a cure for joint pain. Bitter tea made with the blossoms of T. vulgare has been effectively used for centuries as an anthelmintic (vermifuge). Tansy cakes were traditionally served during Lent because of a superstition that eating fish during Lent caused intestinal worms. Note that only T. vulgare is used in medicinal preparations; all species of tansy are toxic, and an overdose can be fatal. The dried flowering herb of Tanacetum is used ethnomedically to treat migraine, neuralgia, and rheumatism, and as an antihelminthic, in conjunction with a competent herbalist to circumvent any possible toxicity.
Traditionally, tansy was often used for its emmenagogue effects, to bring on menstruation or end an unwanted pregnancy. Pregnant women should avoid this herb.
Other uses
In England, bunches of tansy were traditionally placed at windows to keep out flies. Sprigs were placed in bedding and linen to drive away pests.
Tansy has been used throughout many Melbourne gardens and homes to keep away ants.
It is also used by some traditional dyers to produce a golden-yellow pigment. The yellow flowers are dried for use in floral arrangements.
Tansy is also used as a companion plant, especially with cucurbits like cucumbers and squash, or with roses or various berries. It is thought to repel ants, cucumber beetles, japanese beetles, squash bugs, and some kinds of flying insects, among others.
Tansy in art and literature
- A portion of a nineteenth-century poem by John Clare describes the delight of tansy and other herbs:
And where the marjoram once, and sage, and rue,
And balm, and mint, with curl'd-leaf parsley grew,
And double marigolds, and silver thyme,
And pumpkins 'neath the window climb;
And where I often, when a child, for hours
Tried through the pales to get the tempting flowers,
As lady's laces, everlasting peas,
True-love-lies-bleeding, with the hearts-at-ease,
And golden rods, and tansy running high,
That o'er the pale-tops smiled on passers-by.
- From "The Cross Roads; or, The Haymaker's Story", available from a at Project Gutenberg.
- Tansy Strange, a character in The Jem Star by Karen Drury, is named after this wild herb. The name is very appropriate due to her wild character.
See also
- Common ragwort (Senecio jacobaea) which in some regions is called "tansy ragwort"
- Silverweed (Potentilla anserina) a flowering plant once known as "wild tansy"
- List of companion plants
|
| |
|
|
