Is marijuana a single species? Scientists go deeper

Is all marijuana from a singles species, cannabis sativa? Or are there three distinct species: cannabis sativa, cannabis indica, and cannabis ruderalis?

Weed connoisseurs have long grappled with the issue as, intent on their pursuit of a more perfect buzz, they have now built up a couple of generations’ worth of experience with plant breeding, hybridization and cross-pollination. That was pretty much all in the pursuit of getting high, but in the past couple of decades, interest has also turned to cannabinoids other than THC, such as cannabidiol (CBD), with all its apparent medicinal properties, not to mention increased interest in industrial hemp.

Now, as marijuana increasingly moves out from the shadows and into a regulatory—as opposed to prohibitionist—environment, the question becomes ever more pressing, and not just for stoners. With the commercialization of cannabis already well underway in California, Colorado, Washington and other states, and its medicalization advancing worldwide, governments...

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