Chamomile (American English) or camomile (British English; see spelling differences) (/ - /, KAM-ə-myl or KAM-ə-meel), is the common name for several daisy-like plants of the family Asteraceae. Two of the species, Matricaria recutita, and Anthemis nobilis are commonly used to make herbal infusions for traditional medicine. Although there is insufficient scientific evidence that consuming chamomile in foods or beverages has any beneficial effect on health,  Chamomile is famous for its traditional use in a variety of applications. Many individuals advocate and utilize chamomile flower dry powder for numerous conventional health issues due to its anti-inflammatory, antioxidant & mild astringent properties. 
The word "chamomile" derived via French and Latin from Greek χαμαίμηλον (khamaimēlon), "earth apple", from χαμαί (khamai) "on the ground" and μῆλον (mēlon) "apple". First used in the 13th century, the spelling "chamomile" corresponds to the Latin chamomilla and Greek chamaimelon. The spelling "camomile" is a British derivation from the French.
Some commonly used species include:
- Matricaria chamomilla Often called "German chamomile" or "Water of Youth"
- Chamaemelum nobile, Roman, English or garden chamomile, also frequently used (C. nobile Treneague is normally used to create a chamomile lawn).
A number of other species common names include the word "chamomile". This does not mean they are used in the same manner as the species used in the herbal tea known as "chamomile". Plants including the common name "chamomile", of the family Asteraceae, are:
- Anthemis arvensis, corn, scentless or field chamomile
- Anthemis cotula, stinking chamomile
- Cladanthus mixtus, Moroccan chamomile
- Chamaemelum nobile, Roman Chamomile
- Cota tinctoria, dyer's, golden, oxeye, or yellow chamomile
- Eriocephalus punctulatus, Cape chamomile
- Matricaria discoidea, wild chamomile or pineapple weed
- Tripleurospermum inodorum, wild, scentless or false chamomile
Use in beer and ale
Chamomile has historically been used in making beer and ale. Unlike for tea, in which only the flowers are used, the whole plant has been used to make beers and ales, adding a bitter flavor component favored by craft breweries and homebrewers.
The main constituents of chamomile flowers are polyphenol compounds, including apigenin, quercetin, patuletin, and luteolin. Chamomile is under preliminary research for its potential anti-anxiety properties. There is no high-quality clinical evidence that it is useful for treating insomnia or any disease.
The use of chamomile has the potential to cause adverse interactions with numerous herbal products and prescription drugs and may worsen pollen allergies. People who are allergic to ragweed (also in the daisy family) may be allergic to chamomile due to cross-reactivity.
Apigenin, a phytochemical in chamomile, may interact with anticoagulant agents and nonsteroidal anti-inflammatory drugs, while other phytochemicals may adversely interact with sleep-enhancing herbal products and vitamins.
Chamomile consists of several ingredients including coumarin, glycoside, herniarin, flavonoid, farnesol, nerolidol and germacranolide. Despite the presence of coumarin, as chamomile's effect on the coagulation system has not yet been studied, it is unknown if a clinically significant drug-herb interaction exists with antiplatelet/anticoagulant drugs. However, until more information is available, it is not recommended to use these substances concurrently.
Pregnancy and breastfeeding
Because chamomile has been known to cause uterine contractions that can invoke miscarriage, pregnant mothers are advised to not consume Roman chamomile (Chamaemelum nobile). Although oral consumption of chamomile is generally recognized as safe in the United States, there is insufficient clinical evidence about its potential for affecting nursing infants.
The chamomile plant is known to be susceptible to many fungi, insects, and viruses. Fungi such as Albugo tragopogonis (white rust), Cylindrosporium matricariae, Erysiphe cichoracearum (powdery mildew), and Sphaerotheca macularis (powdery mildew) are known pathogens of the chamomile plant. Aphids have been observed feeding on chamomile plants and the moth Autographa chryson causes defoliation.
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