Poison hemlock (Conium maculatum) is among the most deadly
plants in North America. This non-native invasive weed contains highly
toxic piperidine alkaloid compounds, including coniine and
gamma-coniceine, which cause respiratory failure and death when ingested
by mammals. The roots are more toxic than the leaves and stems;
however, all parts of the plant including the seeds should be considered
dangerous. It is a common misconception that poison hemlock sap will
cause skin rashes and blisters. In fact, poison hemlock toxins must be
ingested or enter through the eyes, cuts, or other openings to cause
poisoning. SEE MORE
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