20 of the World's Deadliest Plants
Rhubarb
Where it occurs: Cultivated in Europe, Russia, and the USA. In many countries, rhubarb is used to make pies, salads, and sauces. Some even like to nibble on its raw stalks. Why it is dangerous: Not everyone knows that the leaves and root of this plant are not to be eaten because they contain a huge amount of oxalic acid. They can cause burning in the throat and eyes, kidney stones, nausea, and diarrhea.
