Poison Ivy, Oak, and SumacThey contain urushiol in various parts and can cause a rash upon contact.
Giant HogweedGiant hogweed produces a blistering sap and can cause blindness if it gets into the eyes.
Daffodils
Daffodils contain lycorine in its bulbs. This causes vomiting, nausea, and abdominal pain if ingested.
Poison HemlockAll parts of this plant are toxic, affecting the heart, kidneys, and nervous system if ingested.
Castor BeanCastor bean’s seeds contain ricin, causing cell protein production inhibition and potential fatality if consumed.
ManchineelManchineel is highly toxic, and can cause skin irritation and blistering upon contact.
OleanderOleander is toxic, affecting heart function and potentially lethal in large doses.
Jimson WeedIts consumption leads to hallucinations, confusion, convulsions, and potentially fatal effects.
White snakerootThe milk that this plant contains is toxic, and can lead to violent vomiting, delirium, severe thirst and ultimately death.
Angel’s TrumpetsAll parts of the plant contain toxins such as tropane alkaloids scopolamine and atropine, which can result in diarrhoea and paralysis and even death, if ingested.