Larkspur or Delphinium is a beautiful flowering plant. All plants in the Ranunculaceae family contain diterpene alkaloids. These alkaloids have a neuromuscular blocking effect by inhibiting acetylcholine (neurotransmitter in nervous systems) causing weakness, drooling, abnormal heart rhythms, constipation, abdominal pain, paralysis, tremors and seizures when ingested. When large toxic ingestions, heart and lung failure can be seen, along with death.