CLAUS JENSEN / SCIENCE PHOTO LIBRARY CLAUS JENSEN / SCIENCE PHOTO LIBRARY
Zoom in to the leaf of a stinging nettle (Urtica dioica), showing its stinging trichomes as well as shorter leaf hairs. The stinging nettle is a common plant in much of the northern hemisphere, and is well known for its painful sting. The stings are due to the sharp trichomes, which inject a mixture of chemicals, including histamine, into the skin when touched. Filmed in Denmark.
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