Cannabis strains - Origins and characteristics
Technically and legally all weed strains, whether it’s hemp rope or nice fluffy bud, is Classified as Cannabis Sativa under international law.
That said, Dr McParland, Clarke and Watson show in their book Hemp Diseases and Pests that Cannabis Sativa can be classified into more detailed groups, Cannabis Sativa, Indica, Ruderalis (var spondanea) and Afghanica.
This can be shown through distinct growth patterns, looks, smell, taste, Cannabinoid compounds, etc