Tussilago farfara, commonly known as coltsfoot,[2]: 770 [3] is a plant in the tribe Senecioneae in the family Asteraceae, native to Europe and parts of western and central Asia. The name "tussilago" is derived from the Latin tussis, meaning cough, and ago, meaning to cast or to act on.[4][5] It has had uses in traditional medicine, but the discovery of toxic pyrrolizidine alkaloids in the plant has resulted in liver health concerns.
Tussilago farfara is the only accepted species in the genus Tussilago, although more than two dozen other species have at one time or another been considered part of this group. Most of them are now regarded as members of other genera (Chaptalia, Chevreulia, Farfugium, Homogyne, Leibnitzia, Petasites, Senecio).[1]
Coltsfoot is a perennialherbaceous plant that spreads by seeds and rhizomes. Tussilago is often found in colonies of dozens of plants. The flowers, which superficially resemble dandelions, bear scale-leaves on the long stems in early spring. The leaves of coltsfoot, which appear after the flowers have set seed, wither and die in the early summer. The flower heads are of yellow florets with an outer row of bracts. The plant is typically 10–30 cm (3.9–11.8 in) in height. The leaves have angular teeth on their margins.[6][7]
Coltsfoot is widespread across Europe, Asia, and North Africa, from SvalbardtoMoroccotoChina and the Russian Far East. It is also a common plant in North and South America where it has been introduced, most likely by settlers as a medicinal item, or to provide early blooms for honeybees. The plant is often found in waste and disturbed places and along roadsides and paths. In some areas it is considered an invasive species.[1][8][9]
Comparing dandelion with coltsfoot, in early May. The dandelion is just blooming, but the coltsfoot has already gone to seed. Note that the coltsfoot has no leaves yet.
The common name comes from the leaf's supposed resemblance in shape to a colt's foot.[10] It is a 16th-century translation of the medieval Latin name pes pulli, meaning "foal's foot".[11] Other common names include tash plant, ass's foot, bull's foot, coughwort (Old English),[12] farfara, foal's foot, foalswort, and horse foot. Sometimes it is confused with Petasites frigidus, or western coltsfoot.
It has been called bechion,[13]bechichie, or bechie, from the Ancient Greek word for "cough".[14] Also ungula caballina ("horse hoof"),[13] and chamæleuce.[15]
Coltsfoot has been used in herbal medicine[13] and has been consumed as a food product with some confectionery products, such as Coltsfoot Rock. Tussilago farfara leaves have been used in traditional Austrian medicine internally (as tea or syrup) or externally (directly applied) for treatment of disorders of the respiratory tract, skin, locomotor system, viral infections, flu, colds, fever, rheumatism and gout.[16] An extract of the fresh leaves has also been used to make cough drops and hard candy.[10]
Two cases of supposed liver damage (and death) due to coltsfoot tea have been shown to actually be the result of mistaken identity. In one, coltsfoot tea causing severe liver problems in an infant was actually the result of Adenostyles alliariae (alpendost).[20] In another case, an infant developed liver disease and died because the mother drank tea originally believed to contain coltsfoot during her pregnancy, but which was later shown to be Petasites hybridus (butterbur) or a similar species.[21][22] In one 27-year-old male, ingesting a multicomponent herbal supplement that included coltsfoot may have caused him to develop non-lethal deep vein thrombosis and pulmonary embolism.[23]
In response, the German government banned the sale of coltsfoot. Clonal plants of coltsfoot free of pyrrolizidine alkaloids were then developed in Austria and Germany.[24] This has resulted in the development of the registered variety Tussilago farfara 'Wien', which has no detectable levels of these alkaloids.[25]
^Stace, C. A. (2010). New Flora of the British Isles (Third ed.). Cambridge, U.K.: Cambridge University Press. ISBN9780521707725.
^USDA, NRCS (n.d.). "Tussilago farfara". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 12 December 2015.
^ abNiering, William A.; Olmstead, Nancy C. (1985) [1979]. The Audubon Society Field Guide to North American Wildflowers, Eastern Region. Knopf. p. 410. ISBN0-394-50432-1.
^Grigson G. 1974. A Dictionary of English Plant Names. Allen Lane. ISBN0-71-390442-9.
^Fu, P.P., Yang, Y.C., Xia, Q., Chou, M.C., Cui, Y.Y., Lin G., "Pyrrolizidine alkaloids-tumorigenic components in Chinese herbal medicines and dietary supplements", Journal of Food and Drug Analysis, Vol. 10, No. 4, 2002, pp. 198-211 [1][dead link].
^Röder, E., "Medicinal plants in Europe containing pyrrolizidine alkaloids", Pharmazie, 1995, pp. 83-98. Reprinted on Henriette's Herbal website.[2].
^Sperl, W., Stuppner, H., Gassner, I.; "Reversible hepatic veno-occlusive disease in an infant after consumption of pyrrolizidine-containing herbal tea." Eur. J. Pediatr. 1995;154:112–6.
^Roulet, M., Laurini, R., Rivier, L., Calame, A.; "Hepatic veno-occlusive disease in newborn infant of a woman drinking herbal tea." J Pediatrics. 1988;112:433–6.
^Frohne D, Pfänder HJ. Poisonous Plants: A Handbook for Doctors, Pharmacists, Toxicologists, Biologists and Veterinarians. Timber Press, 2005.
^Freshour JE, Odle B, Rikhye S, Stewart DW. Coltsfoot as a potential cause of deep-vein thrombosis and pulmonary embolism in a patient also consuming kava and blue vervain. J Diet Suppl. 2012;9(3):149-54. doi: 10.3109/19390211.2012.708391.
^Wawrosch, Ch.; Kopp, B.; Wiederfield, H.; "Permanent monitoring of pyrrolizidine alkaloid content in micropropagated Tussilago farfara L. : A tool to fulfil statutory demands for the quality of coltsfoot in Austria and Germany", Acta horticulturae, 2000, no. 530, pp. 469-472 [3].
^Wawrosh C.,"In Vitro Cultivation of Medicinal Plants" cited in Yaniv Z. and Bachrach U., Eds "Handbook of Medicinal Plants", The Hawthorne Medical Press NY Lond. 2005.
R. Schubert & G. Wagner: Botanisches Wörterbuch Ulmer, Stuttgart 1993, ISBN3-8252-1476-1(in German)
H. Haeupler & Th. Muer: Bildatlas der Farn- und Blütenpflanzen Deutschlands Ulmer Verlag, Stuttgart, 2000. ISBN3-8001-3364-4. (in German)
Gerhard Madaus: Lehrbuch der biologischen Heilmittel Bd 1. Heilpflanzen. G. Thieme, Leipzig 1938, Olms, Hildesheim 1979. ISBN3-487-05890-1(in German)
Guide des plantes sauvages comestibles et toxiques, les guides du naturaliste, François Couplan et Eva Stinner ISBN2-603-00952-4(in French)
Кирпичников М. Э. Семейство сложноцветные, или астровые (Asteraceae, или Compositae) // Жизнь растений. В 6-ти т. / Под ред. А. Л. Тахтаджяна. — М.: Просвещение, 1981. — Т. 5. Ч. 2. Цветковые растения. — С. 462–476. — 300000 экз. (in Russian)
