Veratrum: Veratrum is commonly grown for ornamental purposes. However, the beauty of this flower stops there, as every part of the plant is lethally toxic. The first symptoms of Veratrum poisoning are violent stomach pains, which usually start about 30 minutes after ingestion. As toxins fall into the bloodstream, they make a beeline for sodium ion channels, which act as gates that allow sodium to flow through the nerves, triggering a reaction. This causes seizures and fast and slow heartbeats, which can lead to a heart attack or coma.