The two species of the Cannabis genus that are most commonly grown are Cannabis Indica and Cannabis Sativa. There are several key differences between Cannabis Indica and Cannabis Sativa, which includes height and stature, internodal length, leaf size and structure, bud size and density, flowering time, odor, smoke and effects. Indica plants tend to grow shorter and bushier than the sativa plants. The leaves of Indica strains tend to have wide, short leaves with short, wide blades, whereas Sativa strains have long leaves with thin, long blades. The buds of Indica strains tend to be wide, dense and bulky, while Sativa strains are likely to be long, sausage shaped flowers. Both types are used for medical cannabis.