Acorus calamus(Sweet flag root )

Acorus calamus(Sweet flag root )
Common Sweet Flag
Sweet flag
Scientific classification
Kingdom: Plantae
Order: Acorales
Family: Acoraceae
Genus: Acorus
Species: A. calamus
Binomial name
Acorus calamus
Acorus calamus (also called Sweet Flag or Calamus, among many common names) is a tall perennial wetland monocot of the Acoraceae family,
 in the genus Acorus. In spite of common names that include the words "rush" and "sedge," it is neither a rush or sedge.
 The scented leaves and more strongly scented rhizomes have traditionally been used medicinally and to make fragrances,
 and the dried and powdered rhizome has been used as a substitute for ginger, cinnamon and nutmeg.
In addition to "sweet flag" and "calamus" other common names include beewort, bitter pepper root, calamus root, flag root, gladdon,myrtle flag,myrtle grass, myrtle root, myrtle sedge, pine root, rat root, sea sedge, sweet cane, sweet cane, sweet cinnamon, 
sweet grass, sweet myrtle,sweet root, sweet rush, and sweet sedge. Common names in Asia include: "vacha"; "bacch" (Unani); "bajai," "gora-bach," "vasa bach" (Hindi); "vekhand" (Marathi); "vashambu" (Tamil); "vadaja," "vasa" (Telugu); "baje" (Kannada); "vayambu" (Malayalam); "bhutanashini," "jatila" (Sanskrit).
Botanical information
There are three cytotypic forms distinguished by chromosome number: a diploid form (2n=24),
 an infertile triploid form (2n=36), and a tetraploid form. 
The triploid form is the most common and is thought to have arisen relatively recently in the Himalayan region through hybridisation of the diploid with the tetraploid.
Probably indigenous to most of Asia, the triploid form Acorus calamus var. calamus (also known as var.
 vulgaris or var. verus) has now been introduced across Europe, Australia, New Guinea, South Africa,
 Réunion and North America. The tetraploid form Acorus calamus var.
 angustatus is native throughout Asia, from India to Japan and the Philippines and from Indonesia to Siberia.
 The diploid form Acorus americanus or Acorus calamus var. americanus is found in northern subarctic North America and scattered disjunct areas throughout the Mississippi Valley,
 and furthermore diploids are also found in Mongolia, central Siberia (Buryatia), Gilgit–Baltistan in Pakistan (claimed by India) and northern Himachal Pradesh in Bharat2.
 It is extinct in some parts of the United States and Canada. It may not been native to some of these areas,
 Pre-Columbian populations are thought to have dispersed it across parts of the United States.
Currently the taxonomic position of these forms is contested.
 The comprehensive taxonomic analysis in the Kew World Checklist of Selected Plant Families from 2002 considers all three forms to be distinct varieties of a single species.
Sue A. Thompson in her 1995 Phd dissertation and in her 2000 entry in the Flora of North America considers the diploid form to a distinct species.
 Note Thompson only analyses North American forms of the diploid variety in her treatment, and does not analyse the morphology of Asian forms of the diploid variety.
 Also note that in older USA literature the name Acorus americanus may be used indiscriminately for all forms of Acorus calamus occurring in North America,
 irrespective of cytological diversity (i.e. both the diploid and triploid forms). The recent treatment in the Flora of China from 2010, which is followed in the Tropicos database system,
 considers all varieties to be synonyms of a single taxonomically undifferentiated species, pointing to morphological overlap in the characteristics singled out by Thompson.
According to Thompson the primary morphological distinction between the triploid and the North American forms of the diploid is made by the number of prominent leaf veins,
 the diploid having a single prominent midvein with on both sides of this equally raised secondary veins,
 the triploid having a single prominent midvein with the secondary veins barely distinct.
 Thompson notes a number of other details which she claims can be used to tell the different forms apart in North America, 
such as flower length, average maximum leaf length, relative length of the sympodial leaf with respect to the vegetative leaves,
 the average length of the spadix during flowering, and tendency of the leaf margin to undulate in the triploid. She notes that many of these characteristics overlap,
 but that in general the triploid is somewhat larger and more robust on average than most North American forms of the diploid. According to Heng Li,
 Guanghua Zhu and Josef Bogner in the Flora of China there is clear overlap in these characteristics and the different cytotypes are impossible to distinguish morphologically.
Triploid plants are infertile and show an abortive ovary with a shrivelled appearance. This form will never form fruit (let alone seeds) and can only spread asexually.
The tetraploid variety is usually known as Acorus calamus var. angustatus Besser. A number of synonyms are known, but a number are contested as to which variety they belong.
 It is morphologically diverse, with some forms having very broad and some narrow leaves. It is furthermore also cytotypically diverse, with an array of different karyotypes.
A further hexaploid form exists in central and northwestern Yunnan and Kashmir. This form has not been given taxonomic status.
 At least 3 different karyotypes have been classified as hexaploid; 2n=66in Yunnan and 2n=54 and 2n=72 in Kashmir.
Diploid plants in North America apparently produce no or only trace amounts of b-asarone. According to one study, 
triploids produce a small amount, constituting around 0.3% of the rhizome in crude content,
 whereas tetraploids may be found in at least two chemotypes, one with 2.0%, and one with 4.0 to 8.0%.
A. Calamus has been an item of trade in many cultures for thousands of years. It has been used medicinally for a wide variety of ailments,
 and its aroma makes calamus essential oil valued in the perfume industry. The essence from the rhizome is used as a flavor for pipe tobacco.
 When eaten in crystallized form, it is called "German ginger". In Europe Acorus calamus was often added to wine,
 and the root is also one of the possible ingredients of absinthe. It is also used in bitters.  In Lithuania Ajeras (Sweet flag) is added to home baked black bread.
Although probably not native to Egypt, this plant was already mentioned in the Chester Beatty papyrus VI dating to approximately 1300 BC.
 The ancient Egyptians rarely mentioned the plant in medicinal contexts (the afore-mentioned papyrus mentioned using it in conjunction with several ingredients as a bandage used to sooth an ailment of the stomach),
 but it was certainly used to make perfumes.
The first Chinese source to mention the plant is the 神農本草經 (Shennong Bencao Jing), thought to be written anywhere between 200BC to 200AD
 (attributed to Shennong, a legendary demi-god, who is said to have wrote it 2737BC, but first mentioned in the 七錄 (Qilu) catalogue written 502-557AD by 阮孝緒 (Ruan Xiaoxu), 
and complied and expanded in the same period (some claim 492AD) by 陶弘景 (Tao Hongjing) as the 本草經集注 (Bencaojing Jizhu), 
which was itself lost and reconstructed by Sun Xingyan (孫星椼, 1753–1818)). Acorus is listed as 菖蒲 (chang pu), one of the primary herbal medicines.
 Tao Hongjing categorises it as one of the 'superior' 君 (jun) substances; a 'hot' and 'acrid' herb used to open the orifices among other uses.
 Note that there is some confusion about the exact identity of the species mentioned, some sources equate it with Acorus gramineus.  
Initially Europeans confused the identity and medicinal uses of the Acorus calamus of the Romans and Greeks with their native Iris pseudacorus. 
Thus the Herbarius zu Teutsch, published at Mainz in 1485, describes and includes a woodcut of this iris under the name Acorus. 
This German book is one of three possible sources for the French Le Grant Herbier, written in 1486, 1488, 1498 or 1508,
 of which an English translation was published as the Grete Herball by Peter Treveris in 1526, all containing the false identification of the Herbarius zu Teutsch.
 William Turner, writing in 1538, describes 'acorum' as "gladon or a flag, a yelowe floure delyce".
The plant was introduced to Britain in the late 16th century. By at least 1596 true Acorus calamus was grown in Britain,
 as it is listed in The Catalogue, a list of plants John Gerard grew in his garden at Holborn. Gerard notes "It prospereth exceeding well in my garden,
 but as yet bearth neither flowers nor stalke". Gerard lists the Latin name as Acorus verus, but it is evident there was still doubt about its veracity:
 in his 1597 herbal he lists the English common name as 'bastard calamus'.
Cultural uses
In Britain the plant was also cut for use as a sweet smelling floor covering for the packed earth floors of medieval dwellings and churches,
 and stacks of rushes have been used as the centrepiece of rushbearing ceremonies for many hundreds of years. It has also been used as a thatching material for English cottages.
In modern Egypt it is thought to have aphrodisiac properties.
For the Penobscot people this was a very important root. One story goes that a sickness was plaguing the people. A muskrat spirit came to a man in dream,
 telling him that he (the muskrat) was a root and where to find him. The man awoke, found the root, and made a medicine which cured the people. 
In Penobscot homes, pieces of the dried root were strung together and hung up for preservation. Steaming it throughout the home was thought to "kill" sickness. 
While travelling, a piece of root was kept and chewed to ward off illness.
Teton-Dakota warriors chewed the root to a paste, which they rubbed on their faces. It was thought to prevent excitement and fear when facing an enemy.
The Potawatomi people powdered the dried root and placed this up the nose to cure catarrh.
Illustration from an 1885 flora
Herbal medicine
Sweet flag has a very long history of medicinal use in Chinese, Nepali and Bharatian herbal traditions. The leaves, stems,
 and roots are used in various Siddhaand Ayurvedic medicines. It is widely employed in modern herbal medicine as its sedative,
 laxative, diuretic, and carminative properties.It is used in Ayurveda to counter the side effects of all hallucinogens. Sweet Flag,
 known as "Rat Root" is one of the most widely and frequently used herbal medicines amongst the Chipewyan people.
Recreational Drug
It is believed by some that calamus is a hallucinogen. This urban legend is based solely on two pages of a book written by Hoffer and Osmund entitledThe Hallucinogens.
 The information on these two pages came from anecdotal reports from two individuals (a husband and wife) who reported that they had ingested calamus on a few occasions.
None of the components in calamus are converted to TMA (trimethoxyamphetamine) in the human organism. To date there is no solid evidence of any hallucinogenic substances in calamus.