A Historical plant.

Cannabis (/ˈkænəbɪs/) is a genus of flowering plant that includes three species (and seven taxa)[2] or subspecies,[3] sativa, indica, andruderalis. The plant is indigenous to Central Asia and the Indian subcontinent.[4] Cannabis plants are believed to have evolved on the steppes of Central Asia, specifically in the regions that are now Mongolia and southern Siberia.

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. To satisfy the UN Narcotics Convention, some cannabis strains have been bred to produce minimal levels of tetrahydrocannabinol (THC), the principal psychoactive constituent. Many plants have been selectively bred to produce a maximum of THC (cannabinoids), which is obtained by curing the flowers. Various compounds, includinghashish and hash oil, are extracted from the plant.[5]  

For more information please go to wikipedia.com/cannabis.