Urtica dioica is a perennial herb, stem erect, slender, long, grooved, covered with stinging hairs. Leaves ovate or lanceolate, opposite, apex pointed, margins toothed, also covered with stinging hairs. Stipule present. Plant is monoecious, in which male and female flowers are born on separate plant, flowers minute and green, arising in axillary and terminal branching pyramidal clusters. Fruit flattened achenes.
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