Cannabis () is a genus of flowering plants that includes three different species, Cannabis sativa, Cannabis indica and Cannabis ruderalis. These species are indigenous to Central and South Asia. Cannabis has long been used for hemp fibre, for seed and seed oils, for 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 responsible for the high associated with it and which is obtained through the dried flowers of Cannabis plants selectively bred to produce high levels of THC and other psychoactive cannabinoids. Various extracts including hashish and hash oil are also produced from the plant.