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Urtica urens L. - Urticaceae - dwarf nettle, small nettle, dog nettle, annual nettle, Kleine Brennessel
Annual monoecious herb, up to 45cm high, native to the northern hemisphere; densely covered with stinging hairs; leaves broadly elliptic, ovate or obovate, toothed; inflorescences with proximal female and distal male flowers.
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=233501339
The above ground parts of U.urens are used in the same manner as U.dioica.
[Medicinal Plants of the World. Ben-Erik Van Wyk and Michael Wink, Pretoria 2004, 332]
Sturm, J., Krause, E.H.L., Lutz, K.G., Flora von Deutschland in Abbildungen nach der Natur, Zweite auflage, vol.4: t.40 (1905)
http://plantgenera.org/species.php?id_species=1046279