Chamomile

Species

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 necessarily 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
• Cota tinctoria – dyer's, golden, oxeye, or yellow chamomile
• Eriocephalus punctulatus – Cape chamomile
• Matricaria discoidea – wild chamomile or pineapple weed
• Oncosiphon pilulifer – globe chamomile
• Tripleurospermum inodorum – wild, scentless or false chamomile

Uses

Chamomile may be used as a flavoring agent in foods and beverages, mouthwash, soaps, and cosmetics. Chamomile tea is a herbal infusion made from dried flowers and hot water. The entry for chamomile at the National Center for Complementary and Integrative Health (NCCIH) lists two types of chamomile, namely German chamomile and Roman chamomile; these are Matricaria chamomilla and Chamaemelum nobile, respectively. Chamomile has historically been used as one of the flavoring ingredients in beer, and is sometimes used by modern brewers. Usually the whole plant is used, adding a bitter flavor component.

Chamomile, chiefly Chamaemelum nobile cultivars, is used to "upholster" chamomile seats, raised beds which are about half a meter tall, and designed to be sat upon. Chamomile lawns are also used in sunny areas with light traffic.

Research

There is no clinical evidence that chamomile is effective for treating any diseases. Chamomile is under preliminary research for its potential anti-anxiety properties. There is no good evidence that it is useful for treating insomnia.

Phytochemicals

The main compounds in chamomile flowers are coumarins, flavonoids, and polyphenols, including apigenin, quercetin, patuletin, luteolin, and daphnin.

Drug interactions

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 daisies, chrysanthemums, marigolds, or ragweed (all with chamomile in the daisy family), may be allergic to chamomile. Chamomile contains coumarin, glycoside, herniarin, flavonoids, 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 whether a clinically significant drug–herb interaction exists with anticoagulant drugs. However, until more information is available, it is not recommended to use these substances concurrently.

Chamomile should not be used by people with past or present cancers of the breast, ovary, or uterus; endometriosis; or uterine fibroids.

Pregnancy and breastfeeding

Because chamomile has been known to cause uterine contractions that can invoke miscarriage, pregnant women 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.

Agriculture

The chamomile plant is known to be susceptible to many fungi, insects, and viruses. The following fungi are known to attack this plant: Albugo tragopogonis (white rust), Cylindrosporium matricariae, Halicobasidium purpureum, Peronospora leptosperma, Peronospora radii, Phytophthora cactorum, Puccinia anthemedis, Puccinia matricaiae, Septoria chamomillae, and multiple powdery mildew species. Also, yellow virus (Chlorogenus callistephi var. californicus Holmes, Callistephus virus 1A) causes severe damage to this plant. Aphids (Aphis fabae) have been observed feeding on chamomile plants and the moth Autographa chryson causes defoliation. The insect Nysius minor caused shedding of M. chamomilla flowers.

Historical descriptions

Nicholas Culpeper's 17th century The Complete Herbal has an illustration and several entries on chamomel.