| Regno | Plantae |
| Sottoregno | Tracheobionta |
| Superdivisione | Spermatophyta |
| Divisione | Magnoliophyta |
| Classe | Magnoliopsida |
| Ordine | Rosales |
| Famiglia | Urticaceae |
| Genere | Urtica |
| Specie | Urtica dioica |
A herbaceous perennial in the nettle family (Urticaceae) covered in stinging hairs; young leaves are edible when cooked and the plant has long medicinal use.