|Scientific classification |
Papaver somniferum, commonly known as the opium poppy, or breadseed poppy, is a species of flowering plant in the family Papaveraceae. It is the species of plant from which opium and poppy seeds are derived and is a valuable ornamental plant, grown in gardens. Its native range is probably the eastern Mediterranean, but is now obscured by ancient introductions and cultivation.
This poppy is grown as an agricultural crop on a large scale, for one of three primary purposes. The first is to produce seeds that are eaten by humans, known commonly as poppy seed. The second is to produce opium for use mainly by the pharmaceutical industry. The third is to produce other alkaloids, mainly thebaine and oripavine, that are processed by the pharmaceutical industry into drugs such as codeine and oxycodone. Each of these goals has special breeds that are targeted at one of these businesses, and breeding efforts (including the use of GMO) are continually underway. A comparatively small amount of Papaver somniferum is also produced commercially for ornamental purposes.
It is increasingly a misnomer to call Papaver somniferum the opium poppy—as many varieties have been bred, and continue to be bred, that do not produce a significant quantity of opium. The variety known as Sujata produces no latex at all. Breadseed poppy is more accurate as a common name today because all varieties of Papaver somniferum produce edible seeds. This differentiation has strong implications for legal policy surrounding the growing of this plant.
Papaver somniferum is an annual herb growing to about 100 cm (39 in) tall. The plant is strongly glaucous, giving a greyish-green appearance, and the stem and leaves bear a sparse distribution of coarse hairs. The large leaves are lobed, the upper stem leaves clasping the stem, the lowest leaves with a short petiole.:40 It blooms between June and August. The flowers are up to 30–100 mm (1.2–3.9 in) diameter, normally with four white, mauve or red petals, sometimes with dark markings at the base. The fruit is a hairless, rounded capsule topped with 12–18 radiating stigmatic rays, or fluted cap. All parts of the plant exude white latex when wounded.:87:32
Varieties and cultivars
Papaver somniferum has one accepted subspecies, Papaver somniferum subsp. setigerum (DC.) Arcang. It also has many varieties and cultivars. Colors of the flowers vary widely, as do other physical characteristics, such as number and shape of petals, number of flowers and fruits, number of seeds, color of seeds, and production of opium. Papaver somniferum (sometimes called Papaver paeoniflorum) is a subtype of opium poppy whose flowers are highly double, and are grown in many colors. P. somniferum (sometimes called Papaver laciniatum) is a subtype of opium poppy whose flowers are highly double and deeply lobed. The 'Sujata' cultivar produces no latex, having no utility for opioid production.
The native range of opium poppy is probably the Eastern Mediterranean, but extensive cultivation and introduction of the species throughout Europe since ancient times have obscured its origin. It has escaped from cultivation, or has been introduced and become naturalized extensively in all regions of the British Isles, particularly in the south and east and in almost all other countries of the world with suitable, temperate climates.
Poppy seeds and oil
Poppy seeds from Papaver somniferum are an important food item and the source of poppyseed oil, an edible oil that has many uses. The seeds contain very low levels of opiates and the oil extracted from them contains even less. Both the oil and the seed residue also have commercial uses.
Poppy seeds are used as a food in many cultures. They may be used whole by bakers to decorate their products or milled and mixed with sugar as a sweet filling. They have a creamy and nut-like flavor, and when used with ground coconut, the seeds provide a unique and flavour-rich curry base. They can be dry roasted and ground to be used in wet curry (curry paste) or dry curry.
When the European Union attempted to ban the cultivation of Papaver somniferum by private individuals on a small scale (such as personal gardens), citizens in EU countries where poppy seed is eaten heavily, such as countries in the Central-Eastern region, strongly resisted the plan, causing the EU to change course. Singapore, UAE, and Saudi Arabia are among nations that ban even having poppy seeds, not just growing the plants for them. The UAE has a long prison sentence for anyone possessing poppy seeds.
The opium poppy, as its name indicates, is the principal source of opium, the dried latex produced by the seed pods. Opium contains a class of naturally occurring alkaloids known as opiates, that include morphine, thebaine, codeine, papaverine, noscapine and oripavine. The Latin epithet somniferum means "sleep-bringing", referring to the sedative properties of some of these opiates.
The opiate drugs are extracted from opium. The latex oozes from incisions made on the green seed pods and is collected once dry. Tincture of opium or laudanum, consisting of opium dissolved in alcohol or a mixture of alcohol and water, is one of many unapproved drugs regulated by the U.S. Food and Drug Administration (FDA). Its marketing and distribution persists because its historical use preceded the Federal Food, Drug & Cosmetic Act of 1938. Tincture of opium B.P., containing 1% w/v of anhydrous morphine, also remains in the British Pharmacopoeia, listed as a Class A substance under the Misuse of Drugs Act 1971.
Morphine is the predominant alkaloid found in the cultivated varieties of opium poppy that are used for opium production. Other varieties produce minimal opium or none at all, such as the latex-free Sujata type. Non-opium cultivars that are planted for drug production feature a high level of thebaine or orpivine. Those are refined into drugs like oxycodone. Raw opium contains about 8–14% morphine by dry weight, or more in high-yield cultivars. It may be used directly or chemically modified to produce synthetic opioids such as heroin.
Use of the opium poppy antedates written history. Images of opium poppies have been found in ancient Sumerian artifacts (circa 4000 BC). The making and use of opium was known to the ancient Minoans. Its sap was later named opion by the ancient Greeks, from where it gained its modern name of opium.
Opium was used for treating asthma, stomach illnesses, and bad eyesight.
The First and Second Opium Wars between China, and the British Empire and France took place in the late 1830s to the early 1860s, when the Chinese attempted to stop western traders from selling and later smuggling opium into their country from the large crops grown in India. The British in particular had a deep trade deficit with China, and the sale of British-owned Indian opium helped balance it.
The French Romantic composer Hector Berlioz used opium for inspiration, subsequently producing his Symphonie Fantastique. In this work, a young artist overdoses on opium and experiences a series of visions of his unrequited love.
The DEA raided Thomas Jefferson's Monticello estate in 1987. It removed the poppy plants that had been planted continually there since Jefferson was alive and using opium from them. Employees of the foundation also destroyed gift shop items like shirts depicting the poppy and packets of the heirloom seed.
Opium poppies (flower and fruit) appear on the coat of arms of the Royal College of Anaesthetists.
|Poppy seed production – 2016|
|Source: FAOSTAT of the United Nations|
The New York Times reported, in 2014, that Tasmania was the largest producer of the poppy cultivars used for thebaine (85% of the world's supply) and oripavine (100% of the world's supply) production. Tasmania also had 25% of the world's opium and codeine production.
Regional uses and restrictions
In most of Central Europe, poppyseed is commonly used for traditional pastries and cakes, and it is legal to grow poppies throughout the region, although Germany requires a license.
Since January 1999 in the Czech Republic, according to the 167/1998 Sb. Addictive Substances Act, poppies growing in fields larger than 1 hectare (2.5 acres) is obliged for reporting to the local Custom Office. Extraction of opium from the plants is prohibited by law (§ 15 letter d/ of the act). It is also prohibited to grow varieties with more than 0.8% of morphine in dry matter of their capsules, excluding research and experimental purposes (§24/1b/ of the act). The name Czech blue poppy refers to blue poppy seeds used for food.
In the United States, opium poppies and poppy straw are prohibited. As the opium poppy is legal for culinary or esthetic reasons, poppies were once grown as a cash crop by farmers in California. The law of poppy cultivation in the United States is somewhat ambiguous. The reason for the ambiguity is because the Opium Poppy Control Act of 1942 (now repealed) stated that any opium poppies should be declared illegal, even if the farmers were issued a state permit. § 3 of the Opium Poppy Control Act stated:
It shall be unlawful for any person who is not the holder of a license authorizing him to produce the opium poppy, duly issued to him by the Secretary of the Treasury in accordance with the provisions of this Act, to produce the opium poppy, or to permit the production of the opium poppy in or upon any place owned, occupied, used, or controlled by him.
This led to the Poppy Rebellion, and to the Narcotics Bureau arresting anyone planting opium poppies and forcing the destruction of poppy fields of anyone who defied the prohibition of poppy cultivation. Though the press of those days favored the Federal Bureau of Narcotics, the state of California supported the farmers who grew opium poppies for their seeds for uses in foods such as poppyseed muffins. Today, this area of law has remained vague and remains somewhat controversial in the United States. The Opium Poppy Control Act of 1942 was repealed on 27 October 1970. Canada forbids possessing, seeking or obtaining the opium poppy (Papaver somniferum), its preparations, derivatives, alkaloids and salts, although an exception is made for poppyseed.
In some parts of Australia, P. somniferum is illegal to cultivate, but in Tasmania, some 50% of the world supply is cultivated. In New Zealand, it is legal to cultivate the opium poppy as long as it is not used to produce banned drugs.
United Arab Emirates: cultivation of the opium poppy is illegal, as is possession of poppyseed. At least one man has been imprisoned for possessing poppyseed obtained from a bread roll.
Burma bans cultivation in certain provinces. In northern Burma bans have ended a century-old tradition of growing the opium poppy. Between 20,000 and 30,000 former poppy farmers left the Kokang region as a result of the ban in 2002. People from the Wa region, where the ban was implemented in 2005, fled to areas where growing opium is still possible.
Australia (Tasmania), Turkey and India are the major producers of poppy for medicinal purposes and poppy-based drugs, such as morphine or codeine. The USA has a policy of sourcing 80% of its narcotic raw materials from the traditional producers, India and Turkey.
A recent initiative to extend opium production for medicinal purposes called Poppy for Medicine was launched by The Senlis Council which proposes that Afghanistan could produce medicinal opium under a scheme similar to that operating in Turkey and India. The Council proposes licensing poppy production in Afghanistan, within an integrated control system supported by the Afghan government and its international allies, to promote economic growth in the country, create vital drugs and combat poverty and the diversion of illegal opium to drug traffickers and terrorist elements. Senlis is on record advocating reintroduction of poppies into areas of Afghanistan, specifically Kunduz, which has been free of the opium poppy for some time.
The Senlis proposal is based in part on the assertion that there is an acute global shortage of opium poppy–based medicines some of which (morphine) are on the World Health Organisation's list of essential drugs as they are the most effective way of relieving severe pain. This assertion is contradicted by the International Narcotics Control Board (INCB), the "independent and quasi-judicial control organ monitoring the implementation of the United Nations drug control conventions". INCB reports that the supply of opiates is greatly in excess of demand.
Two enzymes and their encoding genes, thebaine 6-O-demethylase (T6ODM) and codeine O-demethylase (CODM), are involved in morphine biosynthesis derived from the opium poppy. The enzymes were identified as non-heme dioxygenases, and were isolated using functional genomics. Codeine O-demethylase produces the enzyme that converts codeine into morphine.
In late 2007, the British government permitted the pharmaceutical company Macfarlan Smith (a Johnson Matthey company, FTSE 100) to cultivate opium poppies in England for medicinal reasons after Macfarlan Smith's primary source, India, decided to increase the price of export opium latex. The Office of Fair Trading has alerted the government to their monopoly position on growing in the UK and worldwide production of diamorphine and recommended consideration. The government's response advocated the status quo, being concerned interference might cause the company to stop production.
Live plants and seeds of the opium poppy are widely sold by seed companies and nurseries in most of the western world, including the United States. Poppies are sought after by gardeners for the vivid coloration of the blooms, the hardiness and reliability of the poppy plants, the exotic chocolate-vegetal fragrance note of some cultivars, and the ease of growing the plants from purchased flats of seedlings or by direct sowing of the seed. Poppy seed pods are also sold for dried flower arrangements.
Since "opium poppy and poppy straw" are listed in Schedule II of the United States' Controlled Substances Act, a DEA license may be required to grow poppies in ornamental or display gardens. In fact, the legal status of strictly ornamental poppy gardens is more nuanced, and destruction of ornamental poppy installations or prosecution of gardeners (except those caught extracting opium via capsule scarification or tea extraction) are virtually unheard of. During the summer, opium poppies can be seen flowering in gardens throughout North America and Europe, and displays are found in many private plantings, as well as in public botanical and museum gardens such as United States Botanical Garden, Missouri Botanical Garden, and North Carolina Botanical Garden.
Many countries grow the plants, and some rely heavily on the commercial production of the drug as a major source of income. As an additional source of profit, the seeds of the same plants are sold for use in foods, so the cultivation of the plant is a significant source of income. This international trade in seeds of P. somniferum was addressed by a UN resolution "to fight the international trade in illicit opium poppy seeds" on 28 July 1998.
As many non-opium cultivars are available, there has been a shift to selling ornamental varieties of those types. Unlike opium-heavy varieties, these cannot be easily processed into usable narcotics by anyone lacking the requisite lab. The Sujata type produces no latex at all so it cannot be used for any kind of drug production.
After the ousting of the Taliban from the town of Marja in the southern Afghan province Helmand by Operation Moshtarak, American and NATO commanders were confronted with the dilemma of, on the one hand, the need to "win the hearts and minds" of the local population and, on the other, the need to eradicate poppy fields and destroy the opium economy that allegedly financed the Taliban insurgency. It has been speculated that US Marines were initially ordered to ignore the crops to avoid trampling the local farmers' livelihood, and that this might have been because there were no significant poppy fields there before the first US forces arrived.
Censorship and misinformation
It is increasingly incorrect to call Papaver somniferum the opium poppy, as many varieties do not produce a significant amount of opium. At least one produces no latex at all. That variety, therefore, also cannot be used to create codeine and other drugs from other alkaloids present in Papaver somniferum latex. This breeding has been done for two purposes. The first is to produce ornamental varieties that cannot be used for home or small-scale opium production, such as one called Danish Flag. Danish Flag and other examples of these cultivars are widely available for consumer purchase, unlike varieties that produce opium. The second is to produce cultivars that can only be used to produce other alkaloids. These are grown commercially for the pharmaceutical industry, as are varieties that are bred for high opium production. Varieties that produce large amounts of opium have been bred for the pharmaceutical industry and are not available for consumers to purchase as seed. The rapidly decreasing availability of Papaver somniferum varieties that produce significant quantities of opium has made laws against the growing of such varieties more questionable, as they don't produce the substance that is the basis for the restrictions.
Some small companies also attempt to profit from the misinformation and information suppression by claiming that varieties that have no significant opium content are a source of significant opium for the home or small-scale grower. Some sites that only sell seeds for opium-free varieties even label the poppies Papaver hybridum instead of Papaver somniferum, possibly to provide the illusion that the business is trying to cleverly work around prohibitions on growing varieties that produce opium. The word heirloom is also sometimes inappropriately applied for marketing purposes to these recent varieties. The extent to which false information is spread in forums relating to recreational drug use and/or drug use relating to self-medication is not something that has received media attention. However, the impact on small business has been examined by a few media articles, such as the one describing the raid on Monticello. That article, published by Alternet, also discussed how censorship relates to historical public knowledge in terms of Papaver somniferum, Thomas Jefferson, and period culture.
The lack of latex in one cultivar and the lack of significant opium production in some others also makes law enforcement difficult, as even many acres of this poppy can be planted that cannot be readily used, or used at all (in the case of the Sujata type), by individuals to produce edible drugs. Non-opium thebaine and orpivine varieties require lab processing for refinement into drugs like oxycodone. Teas and other quick concoctions or extracts from such varieties are toxic, so they are of no use for unlicensed drug producers unless they have labs that are sophisticated enough to refine the thebaine and/or orpivine. Plantings of non-opium varieties could clearly be planted simply for ornamental purposes, to benefit bees (as poppies produce a great deal of pollen), for growing the edible poppyseed — or a combination of such lawful factors.
- Linnaeus, Carl von (1753). Species Plantarum. Laurentius Salvius. p. 508.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 25 January 2015. Retrieved 17 October 2014.
- "Breadseed or opium poppy, Papaver somniferum". University of Wisconsin Extension, Master Gardener Program. Retrieved 7 January 2018.
- "Shake-Up on Opium Island". The New York Times. Retrieved 8 January 2018.
- Gaevskii, A.V. (1999). "On the intraspecies classification of opium poppy (Papaver somniferum L.)". Khimiko-Farmatsevticheskii Zhurnal. 33 (3): 32–36. doi:10.1007/BF02508453. Retrieved 7 January 2018.
- Chaturvedi, Nidarshana (2014). "Latex-less opium poppy: cause for less latex and reduced peduncle strength)" (PDF). Physiologia Plantarum. 150 (3): 436–445. doi:10.1111/ppl.12086. Retrieved 7 January 2018.
- Stace, C. A. (2010). New Flora of the British Isles (Third ed.). Cambridge, U.K.: Cambridge University Press. ISBN 9780521707725.
- Clapham, A.R.; Tutin, T.G.; Warburg, E.F. (1981). Excursion flora of the British Isles (3 ed.). Cambridge, U.K.: Cambridge University Press. ISBN 0521232902.
- Reader's Digest Field Guide to the Wild Flowers of Britain. Reader's Digest. 1981. p. 32. ISBN 9780276002175.
- Blamey, M.; Fitter, R.; Fitter, A (2003). Wild flowers of Britain and Ireland: The Complete Guide to the British and Irish Flora. London: A & C Black. ISBN 978-1408179505.
- "Papaver somniferum L. is an accepted name". theplantlist.org. 23 March 2012. Retrieved 1 November 2017.
- "Papaveraceae Papaver somniferum L". ipni.org. Retrieved 1 November 2017.
- "BSBI Distribution Maps, Papaver somniferum". London, U.K.: Botanical Society of Britain and Ireland.
- "Papaver somniferum L". Copenhagen, Denmark: Global Biodiversity Information Facility, GBIF.org.
- "Papaver somniferum". www.hort.purdue.edu.
- "Mahanandi » Gasagasalu ~ Bendakaaya". Nandyala.org. Retrieved 30 December 2011.
- "5 Recent Food Bans from Around the World". Times of India. Retrieved 8 January 2018.
- "Travel Warning - Khas Khas (Poppy Seed) Imprisonment in UAE". Brett M.Christensen. Retrieved 8 January 2018.
- Bronwen Jean Bryant and Kathleen Mary Knights Pharmacology for Health Professionals, p. 290, at Google Books
- "Unapproved Drugs, What's the Big Deal?" (PDF). International Journal of Pharmaceutical Compounding, Winter 2006. Retrieved 2009-01-03.
- The Extra Pharmacopeia Martindale. Vol. 1, 24th edition. London: The Pharmaceutical Press, 1958, page 924.
- "International Narcotics Control Bureau, Technical Reports, 2008, Part IV, Statistical information on narcotic drugs" (PDF). Retrieved 30 December 2011.
- Kapoor L (1995). Opium Poppy: Botany, Chemistry, and pharmacology. United States: CRC Press. p. 164. ISBN 1-56024-923-4.
- Askitopoulou, Helen; Ramoutsaki, Ioanna A; Konsolaki, Eleni (2002). "Archaeological evidence on the use of opium in the Minoan world". International Congress Series. ScienceDirect. 1242: 23–29. doi:10.1016/S0531-5131(02)00769-0.
- "How the DEA Scrubbed Thomas Jefferson's Monticello Poppy Garden from Public Memory". Alternet.org. Retrieved 7 January 2018.
- "Poppy seed production in 2016, Crops/Regions/World list/Production Quantity (pick lists)". UN Food and Agriculture Organization, Corporate Statistical Database (FAOSTAT). 2017. Retrieved 18 April 2018.
- Ursula Heinzelmann (2008) Food Culture in Germany p. 48
- 167/1998 Sb. Zákon o návykových látkách a o změně některých dalších zákonů, Czech Republic, effective since 1 January 1999; § 29 effective since 1 January 1999; § 29
- Ohlašovací povinnost pěstitelů máku a konopí podle par. 29 zákona č. 167/1999 Sb., o návykových látkách, Celní správa (Custom Service of the Czech Republic), 19. 6. 2014
- Phillip, Rhodri, & Barry Wigmore (2007-07-14). "The painkilling fields: England's opium poppies that tackle the NHS morphine crisis". Evening Standard. Retrieved 2009-09-02.
- "Authorized Sources of Narcotic Raw Materials, 21 CFR Part 1312; Docket No. DEA-282F, RIN 1117-AB03". Drug Enforcement Administration, US Department of Justice. 2008. Retrieved 13 September 2017.
- "Bulletin on Narcotics – 1950 Issue 3 – 002". UNODC. Retrieved 30 December 2011.
- "Controlled Substances Import and Export Act". US Food and Drug Administration. Retrieved 30 December 2011.
- "21 U.S.C. § 188 : US Code – Section 188 TO 188N: Repealed. Pub. L. 91-513, title III, Sec. 1101(a)(7), Oct. 27, 1970, 84 Stat. 1292". Codes.lp.findlaw.com. Retrieved 30 December 2011.
- Harry J. Anslinger (1959). "The traffic in narcotic drugs: The implementation of treaty obligations in regulating the traffic in narcotic drugs" (PDF). The American University Law Review. 8: 112–116.
- Young, David (September 1952). "The international control of narcotic drugs". American Bar Association Journal. 38: 778–80.
- "Poppin' Up Poppies". Texasgardener.com. Retrieved 30 December 2011.
- "United States Code: Title 21,188 to 188n. Repealed. Pub. L. 91–513, title III, 1101(a)(7), Oct. 27, 1970, 84 Stat. 1292 | LII / Legal Information Institute". Law.cornell.edu. Retrieved 30 December 2011.
- "21 USC Chapter 6 – Narcotic Drugs 01/03/2007". Joffelaw.com. Retrieved 30 December 2011.
- "Controlled Drugs and Substances Act 1996". Justice Laws Website, Government of Canada. 4 April 2018. Retrieved 20 June 2018.
- "Poppy Regulation Act". Department of Primary Industry and Resources, Northern Territory Government, Australia. 2016.
- Section 9(4) of the Misuse of Drugs Act states, "It shall be a defense to a charge under subsection (1) [Cultivation of prohibited plants] if the person charged proves that the prohibited plant to which the charge relates was of the species Papaver somniferum, and that it was not intended to be a source of any controlled drug or that it was not being developed as a strain from which a controlled drug could be produced.""New Zealand Legislation: Misuse of Drugs Act 1975". Retrieved 7 July 2012.
- McGrath, Ginny (2008-02-08). "Travellers who 'smuggle' poppy seeds face Dubai jail". The Times. UK. Retrieved 2009-09-02.
- page 4 of the Drug Policy Briefing nr. 29 by the Transnational Institute
- Dicker, Jason. "The Poppy Industry in Tasmania". University of Tasmania. Retrieved 2009-09-02.
- Braund, Claire (2001). "Research driving the Tasmanian poppy industry". Australian Society of Agronomy. Archived from the original on 29 July 2009. Retrieved 2009-09-02.
- "Poppy for Medicine". Poppy for Medicine. Retrieved 2009-09-02.
- International Narcotics Control Board, 2004, Report 2004, Vienna: International Narcotics Control Board: 23.
- Jillian M Hagel & Peter J Facchini (2010-03-14). "Dioxygenases catalyze the O-demethylation steps of morphine biosynthesis in opium poppy". Nature Chemical Biology. Nature Publishing Group. 6 (4): 273–5. doi:10.1038/nchembio.317. PMID 20228795. Retrieved 2010-03-15.
- "Genetic secrets of poppies' painkillers unlocked". Toronto Star. The Canadian Press. 2010-03-15. Retrieved 2010-03-15.
- "Review of undertakings by Macfarlan Smith Limited". Department for Business, Innovation and Skills. March 2006. Archived from the original on 22 November 2008. Retrieved 2 September 2009.
- "Opium derivatives - Government response to OFT review of undertakings by Macfarlan Smith Limited (MSL)" (PDF). Department for Business, Innovation and Skills. March 2006. Archived from the original (PDF) on 4 December 2009. Retrieved 3 October 2012.
- Nordland, Rod (20 March 2010). "U.S. Turns a Blind Eye to Opium in Afghan Town". The New York Times. Afghanistan;Marja (Afghanistan). Retrieved 30 December 2011.
- "Afghan drug cartels squeeze poppy farmers". Bangkokpost.com. 21 March 2010. Retrieved 30 December 2011.
- The Heroin Harvest(dead link)
- Comprehensive profile for Papaver somniferum from MaltaWildPlants.com
- Opium FAQ v1.0 from Opioids.com
- Opium Poppy Cultivation and Heroin Processing in Southeast Asia from the School of Pacific and Asian Studies (dead link)
- "Downward Spiral – Banning Opium in Afghanistan and Burma", Transnational Institute TNI, Debate Paper, June 2005
- "Withdrawal Symptoms in the Golden Triangle – A Drugs Market in Disarray" TNI Paper by Tom Kramer et al.
- Chouvy P.A., 2009, "Opium. Uncovering the Politics of the Poppy", London, I.B. Tauris (Cambridge, Harvard University Press: 2010)
- Rätsch, Christian "The Encyclopedia of Psychoactive Plants, Enthnopharmacology and Its Applications" 1998/2005, Rochester, Vermont, Park Street Press, ISBN 978-0-89281-978-2
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