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Linnaeus was familiar with European hemp, which was widely cultivated at the time. 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. ruderalis Janisch, and Cannabis ruderalis Janisch, as alternative names. kafiristanica Vav., and ruderal populations in Europe to C. However, hemp can refer to any industrial or foodstuff product that is not intended for use as a drug.

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Three species may be recognized: Cannabis sativa, Cannabis indica, and Cannabis ruderalis; C. sativa; or all three may be treated as subspecies of a single species, C. Cannabis has long been used for hemp fibre, for hemp oils, for medicinal purposes, and as a recreational drug.

Industrial hemp products are made from cannabis plants selected to produce an abundance of fiber.

Its use as a mind-altering drug has been documented by archaeological finds in prehistoric societies in Eurasia and Africa. 440 BCE) Histories records, "The Scythians, as I said, take some of this hemp-seed [presumably, flowers], and, creeping under the felt coverings, throw it upon the red-hot stones; immediately it smokes, and gives out such a vapour as no Grecian vapour-bath can exceed; the Scyths, delighted, shout for joy." Classical Greeks and Romans were using cannabis, while in the Middle East, use spread throughout the Islamic empire to North Africa. Various forms of the drug cannabis exist, including extracts such as hashish and hash oil Medical cannabis (or medical marijuana) refers to the use of cannabis and its constituent cannabinoids, to treat disease or improve symptoms.

In 1545, cannabis spread to the western hemisphere where Spaniards imported it to Chile for its use as fiber. Cannabis is used to reduce nausea and vomiting during chemotherapy, to improve appetite in people with HIV/AIDS, and to treat chronic pain and muscle spasms.

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." 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. However, if a large amount is taken orally the effects may last much longer.

Cannabis sativa appears naturally in many tropical and humid parts of the world. After 24 hours to a few days, minuscule psychoactive effects may be felt, depending on dosage, frequency and tolerance to the drug.

Various compounds, including hashish and hash oil, are extracted from the plant. This classification was based on several factors including interfertility, chromosome uniformity, chemotype, and numerical analysis of phenotypic characters. According to Schultes' and Anderson's descriptions, C.

The first pair of leaves usually have 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. as a wild or escaped variety of low-intoxicant Cannabis, and C. Professors William Emboden, Loran Anderson, and Harvard botanist Richard E. sativa is tall and laxly branched with relatively narrow leaflets, C.

At the top of a flowering plant, this number again diminishes to a single leaflet per leaf. Schultes and coworkers also conducted taxonomic studies of Cannabis in the 1970s, and concluded that stable morphological differences exist that support recognition of at least three species, C. indica is shorter, conical in shape, and has relatively wide leaflets, and C.

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