jim·son·weed 
(jĭmsən-wēd′)
(jĭmsən-wēd′)n.
A poisonous annual plant (Datura stramonium) in the nightshade family, having large, trumpet-shaped white or purplish flowers and prickly egg-shaped seed capsules.
[Alteration of Jamestown weed, after Jamestown, Virginia, where in 1676 regimental cooks inadvertently fed the plant to British soldiers and intoxicated them.]