Long ago, cannabis plants grew wild, in regions as far-flung as the Mongolian steppes and the monsoon-soaked hills of Thailand. The plant adapted to its location, gradually morphing into two separate members of the cannabis family: Cannabis indica and Cannabis sativa. Botanists identified the two cannabis varieties over 250 years ago. Then, many years later, they identified a third species—the non-psychoactive Cannabis ruderalis.

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