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PLEASE NOTE:
"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

Frequently (and not so frequently) Asked Questions

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BRIEF: What is the most poisonous plant in the world to humans?


QUESTION:
What is the most poisonous plant in the world to humans?

ANSWER:
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.