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78-426: In order for a person to start using the app, they need to provide evidence, in the form of bioidentification data and mobile carrier records, that they can legally purchase weed. After they have been verified, customers can pay directly through the app at any dispensary that is using Tokken. Tokken turns credit card transactions into a digital token, which can be exchanged back for money that can later be deposited into

156-520: A Scythian word. The ancient Greeks learned of the use of cannabis by observing Scythian funerals, during which cannabis was consumed. In Akkadian , cannabis was known as qunubu ( 𐎯𐎫𐎠𐎭𐏂 ). The word was adopted in to the Hebrew language as qaneh bosem ( קָנֶה בֹּשׂם ). Cannabis is an annual , dioecious , flowering herb . The leaves are palmately compound or digitate , with serrate leaflets . The first pair of leaves usually have

234-416: A chromosome complement of 2n=20, although polyploid individuals have been artificially produced. The first genome sequence of Cannabis , which is estimated to be 820 Mb in size, was published in 2011 by a team of Canadian scientists. The genus Cannabis was formerly placed in the nettle family ( Urticaceae ) or mulberry family ( Moraceae ), and later, along with the genus Humulus ( hops ), in

312-494: A genetic analysis of the same set of accessions led to a three-species classification, recognizing C. sativa , C. indica , and (tentatively) C. ruderalis . Another paper in the series on chemotaxonomic variation in the terpenoid content of the essential oil of Cannabis revealed that several wide-leaflet drug strains in the collection had relatively high levels of certain sesquiterpene alcohols, including guaiol and isomers of eudesmol, that set them apart from

390-405: A bank account. All transactions are logged publicly through a blockchain leger, making the process both anonymous and verified. Tokken has a "pay taxes" function which enables dispensaries to pay their taxes directly to the department. This Cannabis -related article is a stub . You can help Misplaced Pages by expanding it . Cannabis Cannabis ( / ˈ k æ n ə b ɪ s / )

468-418: A controlled environment. When cannabis is cultivated for its psychoactive or medicinal properties, male plants will often be separated from females. This prevents fertilization of the female plants, either to facilitate sin semilla flowering or to provide more control over which male is chosen. Pollen produced by the male is caught and stored until it is needed. When a male plant of one strain pollinates

546-428: A female of another strain, the seeds will be F1 hybrids of the male and female. These offspring will not be identical to their parents. Instead, they will have characteristics of both parents. Repeated breeding results in certain characteristics appearing with greater regularity. It is impossible for a hermaphrodite to create any male-only seeds. A hermaphrodite may create female only seeds and hermaphrodite seeds. Also

624-533: A four group division: In 1785, evolutionary biologist Jean-Baptiste de Lamarck published a description of a second species of Cannabis , which he named Cannabis indica Lam. Lamarck based his description of the newly named species on morphological aspects (trichomes, leaf shape) and geographic localization of plant specimens collected in India. He described C. indica as having poorer fiber quality than C. sativa , but greater utility as an inebriant . Also, C. indica

702-1083: A high degree of potential variation for selection, even in heavily selected hemp cultivars. They also commented that these analyses confirm the continuity of the Cannabis gene pool throughout the studied accessions, and provide further confirmation that the genus consists of a single species, although theirs was not a systematic study per se . An investigation of genetic, morphological, and chemotaxonomic variation among 157 Cannabis accessions of known geographic origin, including fiber, drug, and feral populations showed cannabinoid variation in Cannabis germplasm . The patterns of cannabinoid variation support recognition of C. sativa and C. indica as separate species, but not C. ruderalis . C. sativa contains fiber and seed landraces, and feral populations, derived from Europe, Central Asia, and Turkey . Narrow-leaflet and wide-leaflet drug accessions, southern and eastern Asian hemp accessions, and feral Himalayan populations were assigned to C. indica . In 2005,

780-455: A high percentage of cannabinoids . Several varieties of cannabis , known as hemp , have a very low cannabinoid content, and are instead grown for their fiber and seed. Due to the legal status of the plant in many jurisdictions, Cannabis plant varieties are at high risk of biopiracy . The two species of the Cannabis genus that are most commonly grown are Cannabis indica and Cannabis sativa . A third species, Cannabis ruderalis ,

858-417: A large number of chemicals as part of their defense against herbivory . One group of these is called cannabinoids , which induce mental and physical effects when consumed . Cannabinoids, terpenes , terpenoids , and other compounds are secreted by glandular trichomes that occur most abundantly on the floral calyxes and bracts of female plants. Cannabis , like many organisms, is diploid , having

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936-399: A long history of being used for medicinal purposes , and as a recreational drug known as marijuana or weed . Various cannabis strains have been bred, often selectively to produce high or low levels of tetrahydrocannabinol (THC), a cannabinoid and the plant's principal psychoactive constituent . Compounds such as hashish and hash oil are extracted from the plant. Cannabis is

1014-413: A mature plant. The leaves have a peculiar and diagnostic venation pattern (which varies slightly among varieties) that allows for easy identification of Cannabis leaves from unrelated species with similar leaves. As is common in serrated leaves, each serration has a central vein extending to its tip, but in Cannabis this originates from lower down the central vein of the leaflet, typically opposite to

1092-518: A mind-altering drug has been documented by archaeological finds in prehistoric societies in Eurasia and Africa. The oldest written record of cannabis usage is the Greek historian Herodotus 's reference to the central Eurasian Scythians taking cannabis steam baths. His ( c.  440 BCE ) Histories records, "The Scythians, as I said, take some of this hemp-seed [presumably, flowers], and, creeping under

1170-468: A month or two longer to mature. The subjective effects of sativas and indicas are said to differ, but the ratio of tetrahydrocannabinol (THC) to cannabidiol (CBD) in most named drug varieties of both types is similar (averaging about 200:1). Unlike most commercially developed strains, indica landraces exhibit plants with varying THC/CBD ratios. The informal designation sativa and indica may have various, controversial meanings. Morphologically,

1248-461: A recent movement to characterize strains based on their reported subjective effects. Plant breeding is subject to a different set of rules and regulations, at times contradictory. The International Union for the Protection of New Varieties of Plants (UPOV Convention) grants limited proprietary rights to breeders over their seeds, under certain conditions. In parallel, and often in a conflicting way,

1326-573: A retail market that is decriminalized such as in The Netherlands , where wholesale production is illegal but prosecutions are not always enforced because of the contradiction of the law that is recognised by the courts, competition puts pressure on breeders to create increasingly attractive varieties to maintain market share. Breeders give their strains distinct and memorable names in order to help differentiate them from their competitors' strains, although they may in fact be very similar. Acapulco Gold

1404-637: A separate family, the hemp family (Cannabaceae sensu stricto ). Recent phylogenetic studies based on cpDNA restriction site analysis and gene sequencing strongly suggest that the Cannabaceae sensu stricto arose from within the former family Celtidaceae, and that the two families should be merged to form a single monophyletic family, the Cannabaceae sensu lato . Various types of Cannabis have been described, and variously classified as species , subspecies , or varieties : Cannabis plants produce

1482-542: A series of dispositions aiming to fight against biopiracy require breeders to prove that the free, prior and informed consent was obtained from the communities (often Indigenous peoples or peasant communities ) from where the seeds used to breed the new variety originates. This is the case in particular of the Nagoya Protocol , a treaty complementing the Convention on Biological Diversity , in force since 2014 (2017 in

1560-411: A single leaflet , the number gradually increasing up to a maximum of about thirteen leaflets per leaf (usually seven or nine), depending on variety and growing conditions. At the top of a flowering plant , this number again diminishes to a single leaflet per leaf. The lower leaf pairs usually occur in an opposite leaf arrangement and the upper leaf pairs in an alternate arrangement on the main stem of

1638-510: A single undivided species. The genus is widely accepted as being indigenous to and originating from Asia . The plant is also known as hemp , although this term is often used to refer only to varieties of Cannabis cultivated for non-drug use. Cannabis has long been used for hemp fibre , hemp seeds and their oils , hemp leaves for use as vegetables and as juice . Industrial hemp products are made from cannabis plants selected to produce an abundance of fibre. Cannabis also has

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1716-739: A subject of debate for well over two centuries. This is a contentious issue because there is no universally accepted definition of a species . One widely applied criterion for species recognition is that species are "groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups." Populations that are physiologically capable of interbreeding, but morphologically or genetically divergent and isolated by geography or ecology, are sometimes considered to be separate species. Physiological barriers to reproduction are not known to occur within Cannabis , and plants from widely divergent sources are interfertile. However, physical barriers to gene exchange (such as

1794-522: A taxonomic revision that recognizes a single species of Cannabis with two subspecies (hemp or drug; based on THC and CBD levels) and two varieties in each (domesticated or wild). The framework is thus: This classification was based on several factors including interfertility, chromosome uniformity, chemotype, and numerical analysis of phenotypic characters. Professors William Emboden, Loran Anderson, and Harvard botanist Richard E. Schultes and coworkers also conducted taxonomic studies of Cannabis in

1872-590: A three species system, independently reinforced by Schultes et al (1975) and Emboden (1974): C. sativa , C. indica and C. ruderalis. In 1940, Russian botanists Serebriakova and Sizov proposed a complex poly-species classification in which they also recognized C. sativa and C. indica as separate species. Within C. sativa they recognized two subspecies: C. sativa L. subsp. culta Serebr. (consisting of cultivated plants), and C. sativa L. subsp. spontanea (Vav.) Serebr. (consisting of wild or feral plants). Serebriakova and Sizov split

1950-450: A unique family of terpeno-phenolic compounds called cannabinoids, some of which produce the "high" which may be experienced from consuming marijuana. There are 483 identifiable chemical constituents known to exist in the cannabis plant, and at least 85 different cannabinoids have been isolated from the plant. The two cannabinoids usually produced in greatest abundance are cannabidiol (CBD) and/or Δ - tetrahydrocannabinol (THC), but only THC

2028-400: Is a genus of flowering plants in the family Cannabaceae . The number of species within the genus is disputed. Three species may be recognized: Cannabis sativa , C. indica , and C. ruderalis . Alternatively, C. ruderalis may be included within C. sativa , or all three may be treated as subspecies of C. sativa , or C. sativa may be accepted as

2106-452: Is a golden-leafed Cannabis sativa strain originally from the Acapulco area of southwest Mexico . Bedrocan is a medicinal cannabis variety cultivated from a Dutch medical marijuana Cannabis sativa L. strain, having a standardized content of THC (22%) and CBD (1%). It is currently cultivated by Bedrocan Nederland, Bedrocan Canada and Bedrocan Danmark. It was introduced in 2003 and

2184-522: Is changing medical marijuana laws across America," as well as the "most famous example of medicinal hemp use". Skunk refers to cannabis strains that are strong-smelling and have been likened to the smell of the spray from a skunk . These strains of cannabis are believed to have originated during the early 1990s in the United States prior to larger-scale development and popularization by Dutch growers. Just as with other strains of cannabis , skunk

2262-1000: Is commonly described as "auto-flowering" and may be day-neutral . Cannabis is predominantly dioecious , having imperfect flowers , with staminate "male" and pistillate "female" flowers occurring on separate plants. "At a very early period the Chinese recognized the Cannabis plant as dioecious", and the (c. 3rd century BCE) Erya dictionary defined xi 枲 "male Cannabis " and fu 莩 (or ju 苴 ) "female Cannabis ". Male flowers are normally borne on loose panicles , and female flowers are borne on racemes . Many monoecious varieties have also been described, in which individual plants bear both male and female flowers. (Although monoecious plants are often referred to as "hermaphrodites", true hermaphrodites – which are less common in Cannabis – bear staminate and pistillate structures together on individual flowers, whereas monoecious plants bear male and female flowers at different locations on

2340-488: Is determined or strongly influenced by environmental factors. Ainsworth reviews that treatment with auxin and ethylene have feminizing effects, and that treatment with cytokinins and gibberellins have masculinizing effects. It has been reported that sex can be reversed in Cannabis using chemical treatment. A polymerase chain reaction -based method for the detection of female-associated DNA polymorphisms by genotyping has been developed. Cannabis plants produce

2418-607: Is dispensed through pharmacies after prescription from a physician. Blue Dream is a hybrid cannabis strain widely used for both medical and recreational purposes, developed in 2003. Charlotte's Web is a high- cannabidiol (CBD), low- tetrahydrocannabinol (THC) cannabis variety and extract marketed as a dietary supplement under federal law of the United States. It is produced by the Stanley brothers in Colorado. It does not induce

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2496-556: Is either a variety of C. sativa or a separate species, and proposed C. sativa L. var. ruderalis Janisch, and Cannabis ruderalis Janisch, as alternative names. In 1929, renowned plant explorer Nikolai Vavilov assigned wild or feral populations of Cannabis in Afghanistan to C. indica Lam. var. kafiristanica Vav., and ruderal populations in Europe to C. sativa L. var. spontanea Vav. Vavilov, in 1931, proposed

2574-449: Is heated to temperatures between 250–300 °C, potentially leading to its partial transformation into THC. There is little evidence about the safety or efficacy of cannabinoids in the treatment of epilepsy. In order for there to be genetic stability within a marijuana strain the breeder has to go through selection and breeding, pinpointing the dominant and recessive genes within the two strains being crossed. After analyzing offspring with

2652-400: Is most conveniently answered if such chromosomes were clearly visible in a karyotype . Cannabis was one of the first plant species to be karyotyped; however, this was in a period when karyotype preparation was primitive by modern standards. Heteromorphic sex chromosomes were reported to occur in staminate individuals of dioecious "Kentucky" hemp, but were not found in pistillate individuals of

2730-475: Is not surprising that male-associated markers are relatively abundant. In dioecious plants where sex chromosomes have not been identified, markers for maleness indicate either the presence of sex chromosomes which have not been distinguished by cytological methods or that the marker is tightly linked to a gene involved in sex determination. Environmental sex determination is known to occur in a variety of species. Many researchers have suggested that sex in Cannabis

2808-401: Is possibly as a result of inbreeding . Cannabis has been described as having one of the most complicated mechanisms of sex determination among the dioecious plants. Many models have been proposed to explain sex determination in Cannabis . Based on studies of sex reversal in hemp , it was first reported by K. Hirata in 1924 that an XY sex-determination system is present. At the time,

2886-627: Is psychoactive. Since the early 1970s, Cannabis plants have been categorized by their chemical phenotype or "chemotype", based on the overall amount of THC produced, and on the ratio of THC to CBD. Although overall cannabinoid production is influenced by environmental factors, the THC/CBD ratio is genetically determined and remains fixed throughout the life of a plant. Non-drug plants produce relatively low levels of THC and high levels of CBD, while drug plants produce high levels of THC and low levels of CBD. When plants of these two chemotypes cross-pollinate,

2964-546: Is relatively uncommon in the plant kingdom, and a very low percentage of dioecious plant species have been determined to use the XY system. In most cases where the XY system is found it is believed to have evolved recently and independently. Since the 1920s, a number of sex determination models have been proposed for Cannabis . Ainsworth describes sex determination in the genus as using "an X/autosome dosage type". The question of whether heteromorphic sex chromosomes are indeed present

3042-525: Is shorter, conical in shape, and has relatively wide leaflets, and C. ruderalis is short, branchless, and grows wild in Central Asia . This taxonomic interpretation was embraced by Cannabis aficionados who commonly distinguish narrow-leafed "sativa" strains from wide-leafed "indica" strains. McPartland's review finds the Schultes taxonomy inconsistent with prior work (protologs) and partly responsible for

3120-557: Is slightly larger than the X, but difficult to differentiate cytologically. More recently, Sakamoto and various co-authors have used random amplification of polymorphic DNA (RAPD) to isolate several genetic marker sequences that they name Male-Associated DNA in Cannabis (MADC), and which they interpret as indirect evidence of a male chromosome. Several other research groups have reported identification of male-associated markers using RAPD and amplified fragment length polymorphism . Ainsworth commented on these findings, stating, It

3198-698: Is the most widespread variety, which is usually tall, laxly branched, and found in warm lowland regions. "Indica" designates shorter, bushier plants adapted to cooler climates and highland environments. "Ruderalis" is the informal name for the short plants that grow wild in Europe and Central Asia. Mapping the morphological concepts to scientific names in the Small 1976 framework, "Sativa" generally refers to C. sativa subsp. indica var. indica , "Indica" generally refers to C. sativa subsp. i. kafiristanica (also known as afghanica ), and "Ruderalis", being lower in THC,

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3276-754: Is the one that can fall into C. sativa subsp. sativa . The three names fit in Schultes's framework better, if one overlooks its inconsistencies with prior work. Definitions of the three terms using factors other than morphology produces different, often conflicting results. Breeders, seed companies, and cultivators of drug type Cannabis often describe the ancestry or gross phenotypic characteristics of cultivars by categorizing them as "pure indica", "mostly indica", "indica/sativa", "mostly sativa", or "pure sativa". These categories are highly arbitrary, however: one "AK-47" hybrid strain has received both "Best Sativa" and "Best Indica" awards. Cannabis likely split from its closest relative, Humulus (hops), during

3354-630: Is very short and produces only trace amounts of tetrahydrocannabinol (THC), and thus is not commonly grown for industrial, recreational or medicinal use. However, because Cannabis ruderalis flowers independently of the photoperiod and according to age, it has been used to breed autoflowering strains. Pure sativas are relatively tall (reaching as high as 4.5 meters), with long internodes and branches, and large, narrow-bladed leaves. Pure indica varieties are shorter and bushier, with wider leaflets. They are often favored by indoor growers for their size. Sativas bloom later than indicas , often taking

3432-400: The United States and Canada specifically named products of C. sativa as prohibited materials. Enterprising attorneys for the defense in a few drug busts argued that the seized Cannabis material may not have been C. sativa , and was therefore not prohibited by law. Attorneys on both sides recruited botanists to provide expert testimony. Among those testifying for the prosecution

3510-453: The psychoactive " high " typically associated with recreational marijuana strains that are high in THC. In September 2014, the Stanleys announced that they would ensure that the product consistently contained less than 0.3% THC. Charlotte's Web gained national attention when it was used to treat Charlotte Figi 's epileptic seizures . Her story has led to her being described as "the girl who

3588-497: The "modern" system of taxonomic nomenclature by Carl Linnaeus in 1753, who devised the system still in use for the naming of species. He considered the genus to be monotypic, having just a single species that he named Cannabis sativa L. Linnaeus was familiar with European hemp, which was widely cultivated at the time. This classification was supported by Christiaan Hendrik Persoon (in 1807), Lindley (in 1838) and De Candollee (in 1867). These first classification attempts resulted in

3666-456: The 1970s, and concluded that stable morphological differences exist that support recognition of at least three species, C. sativa , C. indica , and C. ruderalis. For Schultes, this was a reversal of his previous interpretation that Cannabis is monotypic, with only a single species. According to Schultes' and Anderson's descriptions, C. sativa is tall and laxly branched with relatively narrow leaflets, C. indica

3744-678: The European Union). In 2024, the GRATK Treaty was adopted, preventing national patent offices from granting patents based on biopiracy. Patent applicants relying on Cannabis strains will have to disclose the origin of the variety, which often entails compliance under the Nagoya protocol or other similar mechanisms of Access and Benefit Sharing Agreement . In addition to pure indica , sativa , and ruderalis varieties, hybrid varieties with varying ratios of these three types are common, such as

3822-462: The Himalayan mountain range) might have enabled Cannabis gene pools to diverge before the onset of human intervention, resulting in speciation. It remains controversial whether sufficient morphological and genetic divergence occurs within the genus as a result of geographical or ecological isolation to justify recognition of more than one species. The genus Cannabis was first classified using

3900-565: The Middle East, use spread throughout the Islamic empire to North Africa. In 1545, cannabis spread to the western hemisphere where Spaniards imported it to Chile for its use as fiber. In North America, cannabis, in the form of hemp, was grown for use in rope, cloth and paper. Cannabinol (CBN) was the first compound to be isolated from cannabis extract in the late 1800s. Its structure and chemical synthesis were achieved by 1940, followed by some of

3978-555: The White Widow hybrid which has about 60% indica and 40% sativa ancestry. These hybrid varieties exhibit traits from both parental types. There are also commercial crossbred hybrids which contain a mix of both ruderalis, indica or sativa genes, and are usually autoflowering varieties. "Lowryder" was an early auto-flowering hybrid that retained the flowering behavior of ruderalis plants, while also producing appreciable amounts of THC and CBD . Autoflowering cannabis varieties have

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4056-549: The XY system was the only known system of sex determination. The X:A system was first described in Drosophila spp in 1925. Soon thereafter, Schaffner disputed Hirata's interpretation, and published results from his own studies of sex reversal in hemp, concluding that an X:A system was in use and that furthermore sex was strongly influenced by environmental conditions. Since then, many different types of sex determination systems have been discovered, particularly in plants. Dioecy

4134-451: The advantage of being discreet due to their small stature. They also require shorter growing periods, as well as having the additional advantage that they do not rely on a change in the photoperiod to determine when to flower. Breeding requires pollinating a female cannabis plant with male pollen. Although this occurs spontaneously and ubiquitously in nature, the intentional creation of new varieties typically involves selective breeding in

4212-467: The choice to use the term "Indian hemp" (linked to the plant's history in India), hence naming the species as indica. Additional Cannabis species were proposed in the 19th century, including strains from China and Vietnam (Indo-China) assigned the names Cannabis chinensis Delile, and Cannabis gigantea Delile ex Vilmorin. However, many taxonomists found these putative species difficult to distinguish. In

4290-470: The cultivar. Dioecious varieties are preferred for drug production, where the fruits (produced by female flowers) are used. Dioecious varieties are also preferred for textile fiber production, whereas monoecious varieties are preferred for pulp and paper production. It has been suggested that the presence of monoecy can be used to differentiate licit crops of monoecious hemp from illicit drug crops, but sativa strains often produce monoecious individuals, which

4368-457: The deepest point of the notch. Tiny samples of Cannabis also can be identified with precision by microscopic examination of leaf cells and similar features, requiring special equipment and expertise. All known strains of Cannabis are wind-pollinated and the fruit is an achene . Most strains of Cannabis are short day plants , with the possible exception of C. sativa subsp. sativa var. spontanea (= C. ruderalis ), which

4446-414: The differences between species adequately represents the variability found within the genus Cannabis . There are five chemotaxonomic types of cannabis : one with high levels of THC, one which is more fibrous and has higher levels of CBD, one that is an intermediate between the two, another one with high levels of cannabigerol (CBG), and the last one almost without cannabinoids. There has also been

4524-596: The early Miocene , around 19.6 million years ago. Cannabis was widely distributed over Asia by the Late Pleistocene. The oldest known Cannabis in South Asia dates to around 32,000 years ago. Cannabis is used for a wide variety of purposes. According to genetic and archaeological evidence, cannabis was first domesticated about 12,000 years ago in East Asia during the early Neolithic period. The use of cannabis as

4602-527: The early 20th century, the single-species concept (monotypic classification) was still widely accepted, except in the Soviet Union , where Cannabis continued to be the subject of active taxonomic study. The name Cannabis indica was listed in various Pharmacopoeias , and was widely used to designate Cannabis suitable for the manufacture of medicinal preparations. In 1924, Russian botanist D.E. Janichevsky concluded that ruderal Cannabis in central Russia

4680-534: The felt coverings, throw it upon the red-hot stones; immediately it smokes, and gives out such a vapour as no Greek vapour-bath can exceed; the Scyths, delighted, shout for joy." Classical Greeks and Romans also used cannabis. In China, the psychoactive properties of cannabis are described in the Shennong Bencaojing (3rd century AD). Cannabis smoke was inhaled by Daoists , who burned it in incense burners. In

4758-647: The female-only seeds may carry the hermaphrodite trait. Hybridization is the process of plants and animals breeding. Natural wind currents help speed up this hybridization process and promotes a positive growth. Some plants produce many seeds while some produce little to none depending on how it is bred. If seeds are produced traits from both the original parents will be expressed. Techniques such as mutation breeding are used to develop new strains using irradiation or chemical mutagens such as colchicine . Various companies have been experimenting with creating new strains using genetic engineering techniques. During

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4836-598: The first preclinical research studies to determine the effects of individual cannabis-derived compounds in vivo. Globally, in 2013, 60,400 kilograms of cannabis were produced legally . Cannabis strain Cannabis strains is a popular name to refer to plant varieties of the monospecific genus Cannabis sativa L. . They are either pure or hybrid varieties of the plant, which encompasses various sub-species C. sativa , C. indica , and C. ruderalis . Varieties are developed to intensify specific characteristics of

4914-528: The mid Oligocene , around 27.8 million years ago according to molecular clock estimates. The centre of origin of Cannabis is likely in the northeastern Tibetan Plateau . The pollen of Humulus and Cannabis are very similar and difficult to distinguish. The oldest pollen thought to be from Cannabis is from Ningxia , China, on the boundary between the Tibetan Plateau and the Loess Plateau , dating to

4992-405: The name sativa designates tall plants with narrow leaves, while indica refers to short plants with wide leaves. Among the marijuana community however, sativa rather refers to equatorial varieties producing stimulating psychoactive effects, whereas indica -type plants from Central Asia are used for relaxing and sedative drugs (THC:CBD > 1). There is an increasing discussion about whether

5070-490: The other putative taxa. A 2020 analysis of single-nucleotide polymorphisms reports five clusters of cannabis , roughly corresponding to hemps (including folk "Ruderalis") folk "Indica" and folk "Sativa". Despite advanced analytical techniques, much of the cannabis used recreationally is inaccurately classified. One laboratory at the University of British Columbia found that Jamaican Lamb's Bread, claimed to be 100% sativa,

5148-440: The plant, or to differentiate the strain for the purposes of marketing or to make it more effective as a drug . Variety names are typically chosen by their growers , and often reflect properties of the plant such as taste, color, smell, or the origin of the variety. The Cannabis strains referred to in this article are primarily those varieties with recreational and medicinal use . These varieties have been cultivated to contain

5226-405: The plants in the first filial (F 1 ) generation have an intermediate chemotype and produce intermediate amounts of CBD and THC. Female plants of this chemotype may produce enough THC to be utilized for drug production. Whether the drug and non-drug, cultivated and wild types of Cannabis constitute a single, highly variable species, or the genus is polytypic with more than one species, has been

5304-648: The popular usage. Molecular analytical techniques developed in the late 20th century are being applied to questions of taxonomic classification. This has resulted in many reclassifications based on evolutionary systematics . Several studies of random amplified polymorphic DNA (RAPD) and other types of genetic markers have been conducted on drug and fiber strains of Cannabis , primarily for plant breeding and forensic purposes. Dutch Cannabis researcher E.P.M. de Meijer and coworkers described some of their RAPD studies as showing an "extremely high" degree of genetic polymorphism between and within populations, suggesting

5382-408: The position of the second notch down. This means that on its way from the midrib of the leaflet to the point of the serration, the vein serving the tip of the serration passes close by the intervening notch. Sometimes the vein will pass tangentially to the notch, but often will pass by at a small distance; when the latter happens a spur vein (or occasionally two) branches off and joins the leaf margin at

5460-453: The preferred traits a breeder is looking for, the breeder will select the preferred traits and continue to breed those offspring to create the desired final product. Selection is a crucial process for a breeder to create a strain, especially if a client is looking for something with specific plant traits the breeder has to ensure that the hybrid's genetic traits have been closed in enough so unwanted traits aren't expressed in future harvests. In

5538-529: The rise of craft cannabis growers in Canada should ensure quality, experimentation/research, and diversification of strains among private-sector producers. The scientific debate regarding taxonomy has had little effect on the terminology in widespread use among cultivators and users of drug-type Cannabis . Cannabis aficionados recognize three distinct types based on such factors as morphology, native range , aroma, and subjective psychoactive characteristics. "Sativa"

5616-413: The same plant.) Subdioecy (the occurrence of monoecious individuals and dioecious individuals within the same population) is widespread. Many populations have been described as sexually labile. As a result of intensive selection in cultivation , Cannabis exhibits many sexual phenotypes that can be described in terms of the ratio of female to male flowers occurring in the individual, or typical in

5694-429: The same variety. Dioecious "Kentucky" hemp was assumed to use an XY mechanism. Heterosomes were not observed in analyzed individuals of monoecious "Kentucky" hemp, nor in an unidentified German cultivar. These varieties were assumed to have sex chromosome composition XX. According to other researchers, no modern karyotype of Cannabis had been published as of 1996. Proponents of the XY system state that Y chromosome

5772-472: The selective breeding process for medical marijuana, THC:CBD ratios are accounted for and accommodated to the needs of the client's preference/illness. Due to the large genetic diversity and different geographical climates and environments, a wide range of strains and properties exist. THC is associated with the psychoactive high , while CBD is not psychoactive and is purported to have medicinal properties. However, conversion of CBD to THC can occur when CBD

5850-483: The two C. sativa subspecies into 13 varieties, including four distinct groups within subspecies culta . However, they did not divide C. indica into subspecies or varieties. Zhukovski, in 1950, also proposed a two-species system, but with C. sativa L. and C. ruderalis . In the 1970s, the taxonomic classification of Cannabis took on added significance in North America. Laws prohibiting Cannabis in

5928-409: Was Dr. Ernest Small, while Dr. Richard E. Schultes and others testified for the defense. The botanists engaged in heated debate (outside of court), and both camps impugned the other's integrity. The defense attorneys were not often successful in winning their case, because the intent of the law was clear. In 1976, Canadian botanist Ernest Small and American taxonomist Arthur Cronquist published

6006-426: Was considered smaller, by Lamarck. Also, woodier stems, alternate ramifications of the branches, narrow leaflets, and a villous calyx in the female flowers were characteristics noted by the botanist. In 1843, William O’Shaughnessy, used "Indian hemp ( C. indica )" in a work title. The author claimed that this choice wasn't based on a clear distinction between C. sativa and C. indica , but may have been influenced by

6084-501: Was in fact almost 100% indica (the opposite strain). Legalization of cannabis in Canada (as of 17 October 2018 ) may help spur private-sector research, especially in terms of diversification of strains. It should also improve classification accuracy for cannabis used recreationally. Legalization coupled with Canadian government (Health Canada) oversight of production and labelling will likely result in more—and more accurate—testing to determine exact strains and content. Furthermore,

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