Frequently (and not so frequently) Asked Questions
BRIEF: What is the most poisonous plant in the world to humans?
What is the most poisonous plant in the world to humans?
The lectins in castor bean and rosary pea are your best bets. They can be lethal by multiple routes (ingestion, injection, inhalation) and a little goes a long ways. A only a few molecules can inactivate a cell's ribosomes' activity and thereby block protein synthesis.