7. Washington – Western Water Hemlock (Cicuta douglasii)
Western water hemlock is considered the most poisonous plant in North America and is found in wetlands across Washington State. Its white flower clusters resemble Queen Anne’s lace, making misidentification common. The roots contain cicutoxin, a fast-acting neurotoxin that causes violent seizures, respiratory failure, and death. Symptoms can appear within minutes of ingestion. Even small amounts are lethal. Historically responsible for numerous accidental deaths, this plant’s presence near streams and ponds makes it especially dangerous to hikers and children exploring natural areas.
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