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"It was a common folklore in some countries that mandrake would only grow where the semen of a hanged man had dripped on to the ground; this would appear to be the reason for the methods employed by the alchemists who "projected human seed into animal earth". In Germany, the plant is known as the Alraune: the novel (later adapted as a film) Alraune by Hanns Heinz Ewers is based on a soulless woman conceived from a hanged man's semen, the title referring to this myth of the Mandrake's origins."
wikipedia