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Updated by gperezmartinez13 on Oct 10, 2017
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10 Most Poisonous Plants in The World

Top 10 most poisonous plants in the world for Ms. Falconer

1

Oleander (Nerium oleander)

Oleander (Nerium oleander)

Originally from Asia. Called "Ass Killer", causes bloody diarrhea, vomiting, drooling, and irregular heart beat. Deadly toxins in the plant are cardiac glycosides , nerioside and oldendrin. 100 grams (3.5oz) is enough to kill a fully grown horse.

2

White snakeroot (Ageratina altissima)

White snakeroot (Ageratina altissima)

The cause of the toxicity is a type of alcohol, tremetol, which gets its name from the tremors it causes in those poisoned. Along with this there would be violent vomiting, delirium, severe thirst and ultimately death.

The name snakeroot comes from the fact it can be used as a treatment when applied to snakebites.

3

Manchineel (Hippomane mancinella)

Manchineel (Hippomane mancinella)

Bearing fruits known as ‘little apples of death’ this is a plant to steer well clear of. Found in coastal regions of Florida, South and Central America the manchineel is possibly the world’s most poisonous tree.It is also reported that the smoke from burning the wood can cause blindness.

4

Suicide Tree (Cerbera odollam)

Suicide Tree (Cerbera odollam)

In the Indian state of Kerala alone it is thought to be responsible for around 50 deaths a year. Despite being called the suicide tree the toxins work equally well for murder and the flavour is easily hidden in a bowl of spicy food.It is the seed inside the fruit of this plant that is highly poisonous. It contains the powerful alkaloid, cerberin, which is similar to digoxin in foxgloves. These both work by disrupting the heart’s rhythm often with fatal results.

5

Deadly nightshade (Atropa belladonna)

Deadly nightshade (Atropa belladonna)

The main toxins in deadly nightshade are atropine, scopolamine and hyoscyamine all of which effect the nervous system by blocking certain neurotransmitters. Whilst all parts of the plant are toxic, the root is generally most poisonous. A dose of around two to five berries is usually sufficient to kill an adult.
The classic symptoms of poisoning include dilated pupils, blurred vision, dry mouth, hallucinations, loud heart beats (audible several feet away), aggressive behaviour, convulsions, coma and possibly death. The effects of the poison are by no means instant and may take from several hours to days to kick in.

6

Lily of the Valley (Convallaria majalis)

Lily of the Valley (Convallaria majalis)

Lily of the valley can be found throughout Northern Europe and America where it is common in woodland. Despite its pretty appearance it is deadly poisonous containing no less than 38 different cardiac glycosides.The symptoms of lily of the valley poisoning include severe headache, nausea, vomiting, slow heart beat and excessive urination.

7

Hemlock

Hemlock

Hemlock is the poison of the classics. In ancient Greece it was used as a form of execution, most notably on the philosopher Socrates in around 400 BC.Poison hemlock contains the potent toxin coniine. It is estimated that a dose of around 0.15 grams is sufficient to kill an adult. The mode of action of this poison is ‘killing from the outside in’. A numbness of the extremities slowly spreads inwards, culminating in paralysis of the lungs and death.Water hemlock is widely regarded as the most deadly plant in North America.

8

Castor Bean (Ricinus communis)

Castor Bean (Ricinus communis)

It is a more potent poison than cyanide, strychnine or the strongest snake venom. Fortunately, this is only if the toxin is inhaled or injected; if eaten ricin is still very dangerous but aroun a thousand times less deadly. That said it would only take a few of the beans to kill an adult.These shrubby plants are fairly common througout the warmer parts of the world and will grow virtually anywhere. It’s actually quite a pretty plant a blossom of large orange flowers. The symptoms of consuming the beans are not so pretty though; you can expect abdominal cramps, vomiting, internal bleeding and kidney failure. The effects are not immediate and it may take over a day for symptoms to occur. In fatal cases it may take as long as 5 days for the victim to die this unpleasant death.