ケシ
This plant is closely related to and sometimes treated as a subspecies of opium poppy ("Papaver somniferum"). In fact it produces a very small amount of morphine alkaloids. However, "P. somniferum" is diploid (n=11) and "P. setigerum" is tetraploid (n=22) with twice the number of chromosomes. So it cannot be considered the wild ancestral species of the opium poppy.