Dr. Lyman Benson had earlier named a species that was then thought to be the same or that was similar (Pediocactus bradyi, discovered in Arizona in 1958 and which only occurs there).
The botanist Dr. Lyman Benson had earlier identified a plant species that was then assumed to be the same or closely related (Pediocactus bradyi, first found in Arizona in 1958 and confined to that region).