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Sometimes the vein will actually pass tangent to the notch, but often it will pass by at a small distance, and when that happens a spur vein (occasionally a pair of such spur veins) branches off and joins the leaf margin at the deepest point of the notch. In 2004, Hillig and Mahlberg published a chemotaxonomic analysis of cannabinoid variation in their Cannabis germplasm collection. The scientific debate regarding taxonomy has had little effect on the terminology in widespread use among cultivators and users of drug-type Cannabis.

This venation pattern varies slightly among varieties, but in general it enables one to tell Cannabis leaves from superficially similar leaves without difficulty and without special equipment. The botanists engaged in heated debate (outside of court), and both camps impugned the other's integrity. They used gas chromatography to determine cannabinoid content and to infer allele frequencies of the gene that controls CBD and THC production within the studied populations, and concluded that the patterns of cannabinoid variation support recognition of C. Cannabis aficionados recognize three distinct types based on such factors as morphology, native range, aroma, and subjective psychoactive characteristics.

Male flowers are normally borne on loose panicles, and female flowers are borne on racemes. The genus Cannabis was formerly placed in the Nettle (Urticaceae) or Mulberry (Moraceae) family, and later, along with the Humulus genus (hops), in a separate family, the Hemp family (Cannabaceae sensu stricto). In the United States alone, it is believed that over 100 million Americans have tried cannabis, with 25 million Americans having used it within the past year.

Recent phylogenetic studies based on cp DNA restriction site analysis and gene sequencing strongly suggest that the Cannabaceae sensu stricto arose from within the former Celtidaceae family, and that the two families should be merged to form a single monophyletic family, the Cannabaceae sensu lato. The psychoactive effects of cannabis are known to have a triphasic nature.

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.

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 a mature plant. ruderalis is short, branchless, and grows wild in central Asia.

He is thought to have belonged to the Jushi culture recorded in the area centuries later in the Hanshu, Chap 96B.

Near the head and foot of the shaman was a large leather basket and wooden bowl filled with 789g of cannabis, superbly preserved by climatic and burial conditions.

It is also known as hemp, although this term is often used to refer only to varieties of Cannabis cultivated for non-drug use. ruderalis), which is commonly described as "auto-flowering" and may be day-neutral. In the 1970s, the taxonomic classification of Cannabis took on added significance in North America. Indica designates shorter, bushier plants adapted to cooler climates and highland environments.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.In 1785, noted evolutionary biologist Jean-Baptiste de Lamarck published a description of a second species of Cannabis, which he named Cannabis indica Lam. However, many taxonomists found these putative species difficult to distinguish. In 1929, renowned plant explorer Nikolai Vavilov assigned wild or feral populations of Cannabis in Afghanistan to C. Many countries regulate limits for psychoactive compound (THC) concentrations in products labeled as hemp.In North America, cannabis, in the form of hemp, was grown for use in rope, clothing and paper. In 1940, Russian botanists Serebriakova and Sizov proposed a complex classification in which they also recognized C. The term hemp is used to name the durable soft fiber from the Cannabis plant stem (stalk).He considered the genus to be monotypic, having just a single species that he named Cannabis sativa L. stands for Linnaeus, and indicates the authority who first named the species). Cannabis sativa cultivars are used for fibers due to their long stems; Sativa varieties may grow more than six metres tall.

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