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The World’s Most Pois.onous Plants
The World’s Most Pois.onous Plants
Deadly nightshade, Queensland stinging tree, and water hemlock are some of the world’s most poisonous plants, capable of causing fatal effects through touch or ingestion.
Deadly Nightshade
The deadly nightshade, scientifically known as Atropa belladonna, is a highly toxic plant. Every part of this plant, including its visually appealing berries, is poisonous when ingested. Moreover, its toxic effects can begin as soon as you touch it. According to the U.S. Forest Service, the plant contains toxic compounds such as hyoscine and atropine. These substances can cause skin inflammation (blistering, itching, burning, and swelling) and are capable of being absorbed through the skin. Symptoms of poisoning from A. belladonna include blurred vision, headaches, hallucinations, and seizures. Even in small amounts, deadly nightshade can be fatal.
Queensland Stinging Tree
Authorities strongly advise against touching the Queensland stinging tree (Dendrocnide moroides), also known as the gympie gympie or stinging bush, as it can cause pain resembling electric shocks that last for months. Native to Australia, this shrub appears harmless and can easily be mistaken for a common nettle.
Some people describe it as the most painful plant in the world. It is covered with fine, hair-like needles that penetrate the skin and deliver a neurotoxin that doesn’t break down over time, enduring both heat and cold. The resulting intense pain can persist for months. The neurotoxin in the Queensland stinging tree can also trigger a severe allergic reaction known as anaphylaxis.
Environmental scientist Les Moore shared his experience with the toxic plant, describing himself as looking like “Mr. Potato Head” after contact. “I think I went into anaphylactic shock and took days to regain my vision. Within minutes, the initial stinging and burning worsened, and the pain in my eyes felt like someone had thrown acid at me. My mouth and tongue swelled to the point where I had difficulty breathing. I became weak and had to crawl out of the bush,” Moore recounted.
Water Hemlock
The hemlock family includes several toxic species, among which four types of water hemlock (Cicuta species) are particularly lethal and can be found in North America. According to the U.S. Fish and Wildlife Service, the spotted water hemlock (Cicuta maculata) is often referred to as the most dangerous plant in North America. Like deadly nightshade, every part of the water hemlock is extremely toxic due to its high content of cicutoxin.
This neurotoxin can be quickly absorbed through the skin or gastrointestinal tract, targeting brain receptors and causing symptoms such as vomiting, seizures, and convulsions. Without prompt medical treatment, water hemlock poisoning can result in death within 2–3 hours.
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