Datura Stramonium

Commonly known as Thornapple. Datura is strongly narcotic and doses lead to dilation of the pupils, giddiness, delirium and mania. 

The active constituents are the same as Belladonna, i.e.  hyoseyamine and atropine, but in smaller concentrations. Its medical uses are also the same as Belladonna, its effects on coughing and respiratory conditions being slightly stronger.