Lily-of-the-Valley (Convallaria majalis). Deadly parts: The entire plant, particularly the leaves.Toxic toll: Sure, they make for an attractive flower arrangement, but even the water you place cut lily-of-the-valley flowers in contains deadly traces of convallatoxin, which intensifies the heart’s contractions. Just a bite causes headaches, hot flashes, hallucinations, and irritability, not to mention red blotches on cold, clammy skin. The heart will also slow down, potentially leading to coma and death.Photo by Flickr user Stadtkatze
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