18. South Carolina – Carolina Jessamine (Gelsemium sempervirens)
Carolina jessamine produces bright yellow, trumpet-shaped flowers that bloom early in spring. Despite its pleasant fragrance, the plant contains gelsemine, a powerful neurotoxin. Ingestion can cause dizziness, paralysis, slowed breathing, and death. Even honey made from its nectar can be toxic. The plant climbs fences and trees, often growing near homes and roadsides. Its popularity as an ornamental vine increases the risk of accidental exposure, especially for pets and children.
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