SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Stinging nettle (Urtica dioica). This poisonous plant is covered in sharp hairs that break off when touched, releasing an irritant mixture of formic acid and enzymes. Preparations of the stinging nettle are believed to have astringent properties. They are also used as a tonic in herbal medicine.
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