Cannabis ruderalis, or C. sativa subsp. sativa var. spontanea, is a low-THC variety or species of Cannabis which is native to Central and Eastern Europe and Russia. Many scholars accept Cannabis ruderalis as its own species due to its unique traits and phenotypes which distinguish it from Cannabis indica and Cannabis sativa; however, it is widely debated by many other scholars as to whether or not ruderalis is a subspecies of Cannabis sativa.
Cannabis ruderalis was first described by Russian botanist D. E. Janischewsky in 1924. The term ruderalis is derived from the Latin rūdera, which is the plural form of rūdus, a Latin word meaning rubble, lump, or rough piece of bronze. A ruderal species refers to any plant that is the first to colonize land after a disturbance removing competition.
It is widely accepted C. ruderalis is its own species, rather than a subspecies from C. sativa. C. ruderalis as classified in 1924 by D. E. Janischewsky, noting the visible differences in seed, shape and size from previously classified Cannabis sativa. ruderalis represent feral types of cannabis which have higher CBD levels and a more cerebral effect, this combined with the high delta9-thc levels from the C. sativa gives the most potent strains , c. ruderalis occupies regions farther north in latitude. Chemotaxanomic analysis reveals that C. ruderalis is shown to have lower THC levels to the feral biotype of C. sativa.
Cannabis ruderalis is smaller than other species of Cannabis. C. ruderalis rarely grows over two feet in height. Plants have "thin, slightly fibrous stems" with little branching. Foliage is typically open with large leaves, C. ruderalis reaches maturity much quicker than other species of Cannabis, typically in a five to seven week period from seed.
Unlike other species of cannabis, Cannabis ruderalis enters the flowering stage based on the maturity of the plant, rather than its light cycle. With C. sativa and C. indica varieties, it is possible to keep the plant in the vegetative state indefinitely by maintaining a long daylight cycle. C. ruderalis, however, will enter the flowering stage regardless of daily light duration. Cannabis geneticists today refer to this feature as "auto-flowering". 
Cannabis (/ˈkænəbɪs/) 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, Cannabis indica, and Cannabis ruderalis; C. ruderalis may be included within C. sativa; all three may be treated as subspecies of a single species, C. sativa; or C. sativa may be accepted as a single undivided species. The genus is widely accepted as being indigenous to and originating from Central Asia, with some researchers also including upper South Asia in its origin.
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, medicinal purposes, and as a recreational drug. Industrial hemp products are made from cannabis plants selected to produce an abundance of fiber. To satisfy the UN Narcotics Convention, some cannabis strains have been bred to produce minimal levels of tetrahydrocannabinol (THC), the principal psychoactive constituent. Some strains have been selectively bred to produce a maximum of THC (a cannabinoid), the strength of which is enhanced by curing the fruits. Various compounds, including hashish and hash oil, are extracted from the plant.
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In the US, "industrial hemp" is classified by the federal government as cannabis containing no more than 0.3% THC by dry weight. This classification was established in the 2018 Farm Bill and was refined to include hemp-sourced extracts, cannabinoids, and derivatives in the definition of hemp.
Globally, in 2013, 60,400 kilograms of cannabis were produced legally. In 2014 there were an estimated 182.5 million cannabis users (3.8% of the population aged 15–64). This percentage did not change significantly between 1998 and 2014.
While initial results from studies on CBD and weight loss put forth some promising suggestions, there are a few important things to consider.
CBD, or any other compound, supplement, or drug, is not a treatment for obesity. These supplements and compounds do not replace a healthful diet and regular exercise.
A person who adds CBD to their weight loss plan without also exercising and eating healthfully may not see any benefits.
At best, people can consider CBD as a complementary therapy. Not all bodies are the same, and each person may need a slightly different dose.
Someone with more body weight or someone who regularly uses cannabis may need a higher dose, whereas someone who is very sensitive to cannabis or CBD may only need to take a very small amount for the compound to be effective.
It is best to work directly with a doctor when using CBD for weight loss. Doctors will want to discuss any other medications the person is taking, as CBD may cause adverse interactions.
The initial results of studies into CBD and weight loss are promising and may prompt more research into the connection between them.
CBD may be helpful for people looking to lose weight, burn calories, or suppress appetite, but it is vital not to overstate these claims.
A healthful diet and plenty of exercise are still the best weight loss strategies.
CBD should not replace any other medications a person is taking for chronic conditions. People should talk to a doctor before using CBD for any reason, as it may interact with their existing medications.