Recent studies answer the question
Guinness World Records lists this plant as the most poisonous in the world. A toxic superstar, its beans contain alkaloid ricin and toxalbumin ricin. Just one milligram of ricin can end an adult's life.
The Cerbera's seeds contain a toxin called cerberin, which is no friend of the heart.
People are known to have died from drinking the milk or eating the meat of a cow that had ingested snakeroot, which contains a nasty toxin called tremetol.
Some species of rhododendron are poisonous to grazing animals because of a toxin called grayanotoxin, which is found in their pollen and nectar. Similarly, humans have been known to fall ill after eating honey made by bees feeding on the flowers.
You'll end up blowing your own trumpet if you dare snack on this plant, which contains a host of chemicals, including scopolamine and atropine.
This designer orchid encourages wasps to pollinate it by mimicking the shape of the Thynnine wasp. It smells absolutely awful to humans.
Brushing up against this towering and benevolent weed can be costly. Skin will color and blister, and eye exposure to the sap can lead to temporary blindness.
The sweetness of its berries has led children and even adults to snack on this lethal plant, a mistake that can lead to frightening symptoms of paralysis.
When in bloom, this sinister-sounding plant emits a very unpleasant odor—a warning in itself! The whole plant is toxic and touching it may result in skin irritation.
A carnivorous plant that snacks on insects that are attracted to the glistening drops of sweet mucilage covering its leaves.
Also known as cicuta, anyone unfortunate enough to ingest any part of this highly toxic plant will suffer violent seizures, which may lead to death.
The seeds of this plant contain deadly abrin, an extremely toxic toxalbumin. If chewed and ingested, one seed alone can be fatal.
Highly poisonous, this plant enjoys a notorious past. Socrates's assassins were said to have used poison containing deadly coniine and pyridine-type alkaloids drawn from the plant, to murder the great philosopher.
This is arguably the world's deadliest plant. Its leaves contain the toxic alkaloids nicotine and anabasine. Cigarettes really can harm your health.
Accelerated heart rate, muscle tremors, convulsions, collapse, and difficulty breathing are all worrying symptoms of yew plant poisoning, although the flesh of the berries is not toxic.
Touch this and expect an itchy, irritating, and occasionally painful rash. Blistered skin is not uncommon.
The entire plant, including the toy-like berries, is considered poisonous to humans. In fact, the berries contain cardiogenic toxins, which can have an immediate sedative effect on cardiac muscle tissue.
Who would have guessed that such a delicate and pretty flower contains dangerous levels of colchicine, a toxic substance whose effects are similar to arsenic poisoning?
Used in traditional medicine to treat asthma symptoms, the plant is a powerful hallucinogen and deliriant. Careless users run the risk of fatal overdose.
The pain experienced after coming into contact with the prickly hair covering the entire plant is nothing short of excruciating, a sensation similar to being burned by acid.
Do you know which plants and flowers are poisonous? There are some deadly specimens out there, infamous flora that can seriously hurt or even kill you if you're not careful.
Browse the gallery and find out what to avoid, including the most poisonous plant in the world.
Poisonous plants and flowers found in nature
Plants and flowers to die for!
HEALTH Flora
Do you know which plants and flowers are poisonous? There are some deadly specimens out there, infamous flora that can seriously hurt or even kill you if you're not careful.
Browse the gallery and find out what to avoid, including the most poisonous plant in the world.