Henning, T., Quandt, D., Grosse-Veldmann, B., Monro, A., & Weigend, M. (2014).

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), 61–83. https://doi.org/10.11646/phytotaxa.162.2.1