Parietaria filamentosa 1 Mirador de Don Martin, Tenerife 970320 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria filamentosa 2 Punta de Teno, Tenerife 940307 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria filamentosa 3 Miradór de Don Martín, Güímar, Tenerife 160405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria filamentosa 4 Miradór de Don Martín, Güímar, Tenerife 160405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 1 Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 10 near Trujillo SP 140507 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 11 near Trujillo SP 140507 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 12 near Trujillo SP 140507 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 13 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 15 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 16 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 17 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 18 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 19 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 20 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 21 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 22 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 3 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 7 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 8 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria lusitanica 1 Alanya, Turkey 090405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria lusitanica 2 Alanya, Turkey 090405 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 10 Simrishamn Sk 190629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 13 Simrishamn Sk 190629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 14 Simrishamn Sk 190629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 15 Simrishamn Sk 190629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 6 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 7 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 8 Simrishamn Sk 090601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 9 Simrishamn Sk 090601 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 1 Wiedeweltsgade, Copenhagen 930918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 10 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 11 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 12 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 13 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 2 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 4 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 5 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 6 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 7 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 8 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 9 Wiedeweltsgade, Copenhagen 120926 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria cf mauretanica Playa de San Marcos, Tenerife 940310 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria cretica 1 Kotsifou, Crete 110329 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria cretica 2 Arkesia, Karpathos, Greece 040520 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 14 Lund Sk 220705 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 2 Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 4 Lund Bot Garden 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 5 Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 6 Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria judaica 9 Lund Sk 130919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 1 Turda, Romania 090614 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 11 Simrishamn Sk 190629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 12 Simrishamn Sk 190629 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 2 Turda, Romania 090614 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 3 Turda, Romania 090614 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 4 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria officinalis 5 Lund Bot Garden 130610 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 14 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Parietaria pensylvanica 3 Copenhagen Bot Garden 130821 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).