Cannabis probably split from its closest relative, Humulus (hops), in the course of the mid Oligocene, around 27.8 million yrs ago according to molecular clock estimates. The centre of origin of Cannabis is probably going from the northeastern Tibetan Plateau. The pollen of Humulus and Cannabis are certainly very similar https://patriotgoldcomplaint89000.madmouseblog.com/13199661/the-cannabis-bud-diaries