Cannabis 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 indigenous to and originating from Asia.

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.

California cannabis is known as the best in the world and California has the largest cannabis market in the world.