"datura is a plant that grows wild in many parts of India"

Datura stramonium
Creative Commons Attribution Share AlikeDatura stramonium - Credit: Polyparadigm

The book goes on to tell us that datura has white, lily-like flowers with a sweet scent and a round, green seed which is highly poisonous. 

Daturas contain tropane alkaloids which can cause delirium, hyperthermia, amnesia and even death, meaning it has historically been a common poison used for suicide or murder, particularly in India and parts of Europe.