Rosary Pea
One of the most poisonous and dangerous plant species in tropical areas is the rosary pea. In the plant’s seed is the poison abrin, and ingesting just one seed is enough to kill you. You’ve likely seen this seed in necklaces or bracelets before, as they’re commonly found in jewelry. But even though the seeds look beautiful, with their bright red color, they’re incredibly poisonous. If ingested, you’ll experience vomiting, abdominal pain, diarrhea, fast heart rate, hallucinations, seizures, and organ failure (Centers for Disease Control).