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Small. Nettle or Stinging. Nettle (Urtica urens), a widely naturalised. Northern Hemisphere annual that is usually seen as a weed of cultivated ground. Its stinging hairs have a strongly irritant effect. The plant is sometimes used as a vegetable, as cooking destroys the sting. The tiny white flowers are abundant but barely visible. umbilicus-2793htm'>Urtica. Urticaceae.