Every part of the manchineel is poisonous. The fruit is toxic, and the sap from the leaves and stems is too. If touched, the irritants found in manchineel sap can produce inflammation and painful blisters on the skin.
Poison Ivy
The plant may have greenish-white flowers and whitish-yellow berries. Every part of the plant contains an oil that inflames skin and results in painfully itchy blisters and rashes. Inhalation of smoke from burning leaves and vines is extremely hazardous.
The oleander, also known as laurel of flower or trinitaria, is a shrub plant (of Mediterranean origin and therefore, resistant to droughts) with intensely green leaves and whose leaves, flowers, stems, branches and seeds are all highly poisonous, hence it is also known as "the most poisonous plant in the world".
Oleander. Native to Europe and Asia, but planted worldwide in ornamental gardens, oleander is at the top of our list of deadly flowers. It's popular as a backyard plant for good reason. It grows as an evergreen shrub and decorates itself with showy flowers and fruits, not to mention it's extremely hearty.
excelsa. Known colloquially as the gympie gympie (from the Gubbi Gubbi/ Kabi Kabi name for the plant, gimpi gimpi), gympie stinger, and giant stinging tree (D. excelsa), this plant has the dubious honour of being arguably the most painful plant in the world.
The deadliest flower in the insect world is a lifeline to farmers—and the planet. The yellow center of the 'killer chrysanthemum' contains a natural toxin that is a powerful insecticide.
The Deadly Nightshade, Belladonna
Here are other interesting facts about this poisonous flower! With all these highly toxic compounds, one might wonder why deadly nightshade was and is still being used by people.
The Gympie Gympie has broad, oval or heart-shaped leaves and white or purple-red fruit, all covered in tiny stinging hairs. These silicon hairs penetrate your skin, and then break off. They're so tiny, that often the skin will close over the hairs.
Deadly Nightshade
The flowers of this plant are small, reddish purple and tubular shaped, but it is the berries that are the most deadly part of the plant. The atropine found in belladonna disrupts the nervous system and can destroy the body's ability to regulate breathing and heart rate, leading to death.
Gelsemium comes in three flowering varieties – two native to North America and one to China. All three can be deadly. The most toxic variety of gelsemium, Gelsemium elegans, only grows in Asia, and is also known as “heartbreak grass”.
Some consider that the antidote for the poisoning by Gympie could be the plant Cunjevoi (lat. Alocasia brisbanensis), but there is no strong evidence to confirm this. In most cases the poisoned surface is treated by a 10% solution of hydrochloric acid. This achieves neutralization of the peptide layer of the hair.
Urtica incisa, commonly called scrub nettle, stinging nettle, and tall nettle, is an upright perennial herb native to streams and rainforest of eastern and southern Australia, from the north–east southwards through the east, of Queensland and New South Wales, then across the south, through Victoria, Tasmania, south- ...
Given that plants do not have pain receptors, nerves, or a brain, they do not feel pain as we members of the animal kingdom understand it. Uprooting a carrot or trimming a hedge is not a form of botanical torture, and you can bite into that apple without worry.
Plants do not have pain receptors, which is a critical sign that plants do not experience pain in the same way that animals do. Yet the potential to feel pain cannot be inferred simply from the presence of pain receptors alone, specifically, sensory neurons such as nociceptors.
Nicknamed the “beautiful killer”, Purple Loosestrife is a serious threat to wetlands in North America.
1. Botulinum toxin. Scientists differ about the relative toxicities of substances, but they seem to agree that botulinum toxin, produced by anaerobic bacteria, is the most toxic substance known. Its LD50 is tiny – at most 1 nanogram per kilogram can kill a human.
The golden poison frog, Phyllobates terribilis, is the most lethal. In fact, it's the most poisonous vertebrate: the poison in one frog's skin can kill 10,000 mice, between 10-20 adult humans, or two African bull elephants.
Australia and Antarctica finally broke apart around 100 million years ago. Today, venomous snakes are found in all of these places – apart from Antarctica, where it is too cold for them to live. On the original combined land mass, it is thought that there was a population of ancestral snakes that was venomous.