Stock Photo - Urtica dioica, often called common nettle, stinging nettle or nettle leaf, is a herbaceous perennial flowering plant in the family Urticaceae. Have many hollow stinging hairs called trichomes on the leaves and stems, which act like hypodermic needles, injecting histamine and other chemicals that produce a stinging sensation when contacted by humans and other animals. The plant has a long history of use as a source of medicine, food, and fibre. Santa Pau, Girona, Catalonia, Spain.

Stock Photo: Urtica dioica, often called common nettle, stinging nettle or nettle leaf, is a herbaceous perennial flowering plant in the family Urticaceae.