Li Shizhen left his hometown to the north looking for the jimsonweed flowers. Finally he found it, the flower with a sole stem as high as four to five chi, leaves like eggplant leaves and flowers resembling the morning glories. The jimsonweed flower bloomed in the morning and closed up at night. He tasted it himself in order to know the flower’s properties. According to modern pharmacology, the jimsonweed flower contains effective factors to activate the brain and medulla through the central nerve system, as well as lull the nerve endings or parasympathetic nerves.