Manchineel has a fearsome reputation for good reason: its milky sap can ooze from several parts of the tree, and its fruit is poisonous. But the available evidence does not prove that it is the world’s most dangerous tree, or that every exposure is fatal. The clearest clinical evidence comes from 97 reported fruit-ingestion cases in French Poison Control Centers between 2009 and 2017.
What is manchineel?
Manchineel is Hippomane mancinella L., a tree whose common names include manchineel and Spanish-little apple. Kew Science’s Plants of the World Online records the species and warns that its fruit is poisonous. Its apple-like appearance is not a sign that it is safe to eat.
Kew states: “The fruits are likewise poisonous, and children should be warned to shun them.”
Why is the tree hazardous?
Its sap can reach more than the fruit
The University of Florida IFAS Extension describes the tree’s sap as thick and milky, and says it may ooze from leaves, twigs, bark and fruit. That means the potential hazard is not limited to someone eating the fruit: touching sap-bearing parts of the tree can also expose a person.
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Ingestion can cause illness
A 2019 paper in Toxicon reviewed 97 manchineel fruit-ingestion cases reported to French Poison Control Centers from 2009 through 2017. Oropharyngeal pain or irritation, abdominal pain and diarrhea were among the most commonly observed symptoms. The series also recorded one case of laryngeal edema and one of bradycardia.
Upper gastrointestinal endoscopy was performed in five cases; none showed major gastrointestinal lesions. The authors noted that ingestion can cause digestive irritation and abdominal pain requiring medical attention. They described severe mouth or throat injury and hemodynamic problems as rare events, particularly after several fruits, and said specialist consultation or several hours of cardiac monitoring may be appropriate in such cases.
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The 97 cases are reports collected by poison centers, not a population-wide estimate. They cannot tell you the chance of illness from a single bite, establish a fatality rate, or show how often exposure occurs. The paper also says its analysis of harvested fruit did not confirm physostigmine, so that compound should not be presented as an established explanation for the reported bradycardia.
Is it really Earth’s most dangerous tree?
That superlative is not established by the evidence available here. The sources document toxic sap, poisonous fruit and real cases of illness after ingestion, but they do not compare manchineel with other dangerous trees using a common measure such as exposure likelihood, severity, or deaths. Calling it definitively the most dangerous would go beyond what those sources show.
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Nor does the evidence support saying that any contact or every ingestion is inevitably fatal. The poison-center series includes serious events, but its most commonly reported symptoms were pain, irritation and diarrhea. The practical conclusion is to treat the tree and its fruit as hazardous, not to assume a particular outcome from every exposure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to avoid exposure
- Do not touch the tree or stand beneath it. The U.S. Fish and Wildlife Service handout gives both precautions.
- Do not eat fruit from an unidentified tree; manchineel fruit can look deceptively familiar.
- If you think you have touched the tree, eaten its fruit, or otherwise been exposed, contact local poison control or emergency medical services for advice. Seek urgent medical help if symptoms are severe.
Rain falling through the canopy could be a possible way to come into contact with sap, but the sources cited here do not quantify that risk. They do not establish that an ordinary raindrop beneath the tree inevitably causes severe injury.
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What the evidence does—and does not—show
- Established: manchineel is Hippomane mancinella; its fruit is poisonous; and its milky sap may ooze from leaves, twigs, bark and fruit.
- Documented clinically: poison centers recorded 97 fruit-ingestion cases in France from 2009 to 2017, with digestive and mouth or throat symptoms commonly reported and a small number of serious events.
- Not established by these sources: a global ranking of tree danger, inevitable fatality after exposure, or a quantified risk from rain beneath the canopy.
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