
9. Colorado – Monkshood (Aconitum napellus)
Monkshood grows in Colorado’s mountainous regions and is easily recognized by its deep blue, hood-shaped flowers. It contains aconitine, a deadly neurotoxin that can be absorbed through the skin. Ingestion or improper handling can cause numbness, irregular heartbeat, respiratory failure, and death. Historically used in poisoned arrows, monkshood is one of the most toxic flowering plants in the world. Even touching the plant without gloves can be dangerous. Its elegant appearance contrasts sharply with its lethal chemistry.
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