It is a large, coarse, unpleasant-smelling plant, all parts of which are poisonous.  
It is a large, coarse, unpleasant-smelling plant, all parts of which are poisonous.  The poisonous principles in this plant are alkaloids that affect the nervous system and induce trembling, loss of coordination, and paralysis of respiration.  FTP name this herb classified as Conium maculation, the cause of Socrates' death.
It is a large, coarse, unpleasant-smelling plant, all parts of which are poisonous.  
Hemlock or Poison Hemlock