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Chamomile or camomile (// KAM-ə-meel or // KAM-ə-myl) is the common name for several daisy-like plants of the family Asteraceae that are commonly used to make a herb infusion that can help to induce sleep. Because chamomile can cause uterine contractions that can cause miscarriage, the U.S. National Institutes of Health recommends that pregnant and nursing mothers not consume chamomile. Persons who are allergic to ragweed (also in the daisy family) may also be allergic to chamomile, due to cross-reactivity. However, there is still some debate as to whether people with reported allergies to chamomile were truly exposed to chamomile, or to a plant of similar appearance.
The word "chamomile" derives, via French and Latin, from Greek χαμαίμηλον (khamaimēlon), i.e. "earth apple", from χαμαί (khamai) "on the ground" + μῆλον (mēlon) "apple". The more common British spelling "camomile," is the older in English, while the spelling "chamomile" more accurately corresponds to the ultimate Latin and Greek source. The spelling camomile more accurately corresponds to the more immediate derivation from French.
Some commonly-used species include:
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:
Major chemical compounds present within chamomile include apigenin and alpha-bisabolol. Other classes of chemical compounds found within the chamomile plant include: sesquiterpenes, terpenoids, flavonoids, coumarins such as herniarin and umbelliferone, phenylpropanoids such as chlorogenic acid and caffeic acid, flavones such as apigenin and luteolin, flavanols such as quercetin and rutin, and polyacetylenes.
Apigenin has demonstrated strong chemopreventive effects, while alpha-bisabolol has been shown to have antiseptic properties, anti-inflammatory properties, and has also been demonstrated to reduce pepsin secretion without altering secretion of stomach acid. Chemical compounds present within chamomile have demonstrated the ability to bind GABA receptors, modulate monoamine neurotransmission, and have displayed neuroendocrine effects. Umbelliferone has been shown to be fungistatic. Coumarin compounds present in chamomile such as herniarin and umbelliferone may have blood-thinning properties, and there is some evidence that chamomile may interact with other medications causing drug-drug interactions.
Chamomile has been used for inflammation associated with hemorrhoids when topically applied. There is Level B evidence to support the claim that chamomile possesses anxiolytic (anti-anxiety) properties and may have clinical applications in the treatment of stress and insomnia. Chemical components of chamomile extract have demonstrated anti-inflammatory, antihyperglycemic, antigenotoxic, and anticancer properties when examined in vitro and in animal studies.
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.