The plant Atropa belladonna, a perennial shrub of the nightshade family that contains high concentrations of the alkaloid atropine which can be deadly if taken in excess
bittersweet: poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America
belladonna: perennial Eurasian herb with reddish bell-shaped flowers and shining black berries; extensively grown in United States; roots and leaves yield atropine