13. Louisiana – Water Hemlock (Cicuta maculata)
Water hemlock thrives in Louisiana’s swamps and wetland areas and is one of the most lethal plants in North America. It features clusters of small white flowers and hollow stems that resemble edible plants. The roots contain cicutoxin, which causes rapid-onset seizures, violent convulsions, and death, sometimes within an hour. Even minimal exposure can be fatal. Historically, water hemlock has caused numerous accidental poisonings. Its presence near water sources makes it especially dangerous for children and animals exploring muddy or flooded environments.
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