| Author | Title | Journal/publisher | Literature ref. no. |
| Clapham, A.R., Tutin, T.G. & Warburg, E.F. (1952) | Flora of the British Isles. 1st edition. | Cambridge University Press, Cambridge | 155 |
Note that the process of capturing references from species to the literature and the reverse may be incomplete.
| Species found: 2 |
| Urtica dioica (cultivated) |
| Urtica urens |