Another possibility, they said, is that traders may have unwittingly caused hybridization as they moved plants along the Silk Road routes through the high mountain passes of the remote Pamirs, which connected regions of what are now known as China, Tajikistan and Afghanistan.
The tombs varied in size as well as the number of bodies, prompting researchers to wonder whether the ritualistic use of cannabis for mortuary rites had spread to common folk from being an exclusive practice for elite tribal leaders and priests.
These tombs have a distinctive appearance, the researchers noted. They are separated by rows of black and white stones, the purpose of which is unknown. Individual burials are within round mounds, additionally marked by stones.
Use of two parts of the cannabis plant — fibers for hemp rope, sail canvas (a word derived from “cannabis”) and clothing; oily seeds