Mauritania? I assume it comes from the banks of Senegal river. When I was there weed was grown on the Senegalese side nobody would dare growing on the Mauritanian side, much simpler and safer in Senegal and water is not as scarce. I really doubt a strain have been cultivated for long enough on the Mauritanian side to be called Mauritanian. I can believe some people at a point found an opportunity to grow in Mauritania and brought Senegalese seeds