- Photo: Ulex europaeus 1.
- Photo: Ulex europaeus 2.
- Photo: Ulex europaeus 3.
- Photo: Ulex europaeus 4.
- Photo: Ulex europaeus 5.
- Photo: Ulex europaeus 6.
- Photo: Ulex europaeus 7.
- Photo: Ulex europaeus 8.
- Photo: Ulex europaeus.
- Photo: Ulmus glabra 1.
- Photo: Ulmus glabra 4.
- Photo: Ulmus glabra 5.
- Photo: Ulmus glabra 6.
- Photo: Ulmus glabra 7.
- Photo: Ulmus glabra 8.
- Photo: Ulmus glabra.
- Photo: Ulmus laevis 1.
- Photo: Ulmus laevis 2.
- Photo: Ulmus laevis.
- Photo: Ulva intestinalis 1.
- Photo: Ulva intestinalis 2.
- Photo: Ulva intestinalis.
- Photo: Uncarina roeoesliana.
- Photo: Urtica cannabina 1.
- Photo: Urtica cannabina 2.
- Photo: Urtica cannabina 3.
- Photo: Urtica cannabina.
- Photo: Urtica dioica 1.
- Photo: Urtica dioica 10.
- Photo: Urtica dioica 11.
- Photo: Urtica dioica 12.
- Photo: Urtica dioica 13.
- Photo: Urtica dioica 14.
- Photo: Urtica dioica 15.
- Photo: Urtica dioica 17.
- Photo: Urtica dioica 19.
- Photo: Urtica dioica 20.
- Photo: Urtica dioica 21.
- Photo: Urtica dioica 25.
- Photo: Urtica dioica 26.
- Photo: Urtica dioica 27.
- Photo: Urtica dioica 29.
- Photo: Urtica dioica 3.
- Photo: Urtica dioica 30.
- Photo: Urtica dioica 31.
- Photo: Urtica dioica 4.
- Photo: Urtica dioica 5.
- Photo: Urtica dioica 6.
- Photo: Urtica dioica 7.
- Photo: Urtica dioica 8.
- Photo: Urtica dioica sond 1.
- Photo: Urtica dioica sond 2.
- Photo: Urtica dioica sond.
- Photo: Urtica dioica.
- Photo: Urtica pilulifera 1.
- Photo: Urtica pilulifera.
- Photo: Urtica urens.
- Photo: Usnea filipendula.
- Photo: Usnea florida.
- Photo: Usnea hirta.
- Photo: Usnea.
- Photo: Utricularia sandersonii 1.
- Photo: Utricularia sandersonii.
- Photo: Uvularia grandiflora 1.
- Photo: Uvularia grandiflora 2.
- Photo: Uvularia grandiflora 3.
- Photo: Uvularia grandiflora.
U
The Us.