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Weeding the Nettles II: A delimitation of “Urtica dioica L.” (Urticaceae) based on morphological and molecular data, including a rehabilitation of Urtica gracilis Ait.

. Phytotaxa. 162, 2 (Mar. 2014), 61–83. DOI:https://doi.org/10.11646/phytotaxa.162.2.1.