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This tree in the Americas is so toxic, you can’t stand under it when it rains

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In 1999, radiologist Nicola Strickland went on a holiday to the
Caribbean island of Tobago, a tropical paradise complete with idyllic,
deserted beaches. On her first morning there, she went foraging for
shells and corals in the white sand, when the holiday quickly took a
turn for the worse.
Scattered amongst the coconuts and mangoes on the beach, Strickland and her friend found
some sweet-smelling green fruit that looked much like small crabapples.
Both foolishly decided to take a bite, and within moments the pleasant,
sweet taste was overwhelmed by a peppery, burning feeling and an excruciating tightness in the throat that gradually got so bad they could barely swallow.
The fruit in question belonged to the manchineel tree (Hippomane mancinella),
sometimes referred to as ‘beach apple’ or ‘poison guava’. It’s native
to the tropical parts of southern North America, as well as Central
America, the Caribbean, and parts of northern South America. 
The plant bears another name in Spanish, arbol de la muerte, which literally means “tree of death”. According to the Guinness World Records, the manchineel tree is in fact the most dangerous tree in the world. As explained by the Florida Institute of Food and Agricultural Sciences, all parts of manchineel are extremely poisonous, and “interaction with and ingestion of any part of this tree may be lethal”. 

Manchineel belongs to the large and diverse Euphorbia
genus, which also contains the decorative Christmas poinsettia. The tree
produces a thick, milky sap, which oozes out of everything – the bark,
the leaves and even the fruit – and can cause severe, burn-like blisters
if it comes into contact with the skin.  
This sap contains a range of toxins, but it’s thought that the
most serious reactions come from phorbol, an organic compound that
belongs to the diterpene family of esters. Because phorbol is highly
water-soluble, you don’t even want to be standing under a manchineel
when it’s raining – the raindrops carrying the diluted sap can still
severely burn your skin.
Because of these horrifying properties, in some parts of the tree’s
natural range they are painted with a red cross, a red ring of paint, or
even paired with explicit warning signs. We could just remove them, but
they play a valuable role in the local ecosystems – as a large shrub,
the manchineel grows into dense thickets that provide excellent
windbreaking and a protection against coastal erosion on Central
American beaches. 

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There have been reports of severe cases of eye inflammation and
even temporary blindness causes by the smoke of burning manchineel wood –
not to mention the effects of inhaling the stuff. However, Caribbean
carpenters have been using manchineel wood in furniture for centuries – after carefully cutting it and drying in the sun to neutralise the poisonous sap.
 
“The real death threat comes from eating its small round fruit,” Ella Davies writes for the BBC. “Ingesting the fruit can prove fatal when severe vomiting and diarrhoea dehydrate the body to the point of no return.” 
Fortunately, Strickland and her friend lived to tell the tale,
because they only ate a tiny amount of death apple. In 2000, Strickland
published a letter in The British Medical Journal, describing her symptoms in detail. 
It took over 8 hours for their pain to slowly subside, as they
carefully sipped pina coladas and milk. The toxin went on to drain into
the lymph nodes on their necks, providing further agony. “Recounting our
experience to the locals elicited frank horror and incredulity, such
was the fruit’s poisonous reputation,” Strickland wrote. “We found our
experience frightening.”
This article was originally published at Sciencealert

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