Oenothera 1 (cult) Brunnby Sk 080815 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera 2b (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera 3a SA Fish Hoek, Cape peninsula, Western Cape, South Africa 100930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera 3b Fish Hoek, Cape peninsula, Western Cape, South Africa 100930 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera acaulis 1 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera acaulis 2 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 1 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 10 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 11 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 14 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 16 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 17 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 3 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 8 Römö, Jylland DK 950806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 2 Hedehusene station, Sjaelland DK 130630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 3 Hedehusene station, Sjaelland DK 130630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 4 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 7 Kävlinge, Skåne 910914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 8 Kävlinge, Skåne 910914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera caespitosa 2 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera canescens 1 Gorman Hills, CA 130409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera canescens 2 Gorman Hills, CA 130409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera canescens 3 Gorman Hills, CA 130409 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf gaura 2 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf grandiflora 2 (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf muricata 3 Lund Sk 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf muricata 4 Böckstein, Austria 080701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera fruticosa 1 Lund Bot Garden 130619 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera fruticosa 2 Lund Bot Garden 130619 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera fruticosa 4 Lund Bot Garden 150713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera fruticosa 5 Lund Bot Garden 150713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera gaura 2 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera glazioviana 1 Höllviken Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera glazioviana 2 Höllviken Sk 060716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera glazioviana 3 Höllviken Sk 060716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera glazioviana 4 Höllviken Sk 130804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera macrocarpa 1 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera macrocarpa 2 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera missouriensis 2 Kungsmarken, Södra Sandby Sk 190617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera missouriensis 3 Kungsmarken, Södra Sandby Sk 190617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera muricata 4 Höllviken Sk 130622 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera muricata 5 Höllviken Sk 130621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera pallida 2 Bergianska, Stockholm 050922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perangusta 2 Ignaberga stn, Skåne 960712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 3 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 4 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 5 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 6 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 7 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 1 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 2 Lund Bot Garden 120918 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 3 Yunnan - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 1 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 3 Bergianska, Stockholm 020416 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 4 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 5 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 6 (cult) Drama, N Greece 180703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 7 (cult) Drama, N Greece 180703 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera stricta 2 Haleakala, Maui, Hawaii 130716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera versicolor 3 Copenhagen Bot Garden 080710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera versicolor 4 Copenhagen Bot Garden 080710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera versicolor 5 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera 2a (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera acaulis 3 Tiger Creek, Zapallar, Chile 171105 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 12 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 13 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 15 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 2 Copenhagen Bot Garden 121017 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 4 Agger Tange, Jylland DK 060806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 5 southern Fanö DK 080808 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 6 Römö, Jylland DK 950806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 7 Römö, Jylland DK 950806 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera ammophila 9 Henne Strand, Jylland DK 140801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 1 Hedehusene station, Sjaelland DK 130630 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 10 Skurup Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 5 Kävlinge, Skåne 910914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 6 Kävlinge, Skåne 910914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera biennis 9 Skurup Sk 140914 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera caespitosa 1 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf gaura 1 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf gaura 3 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf grandiflora 1 (cult) Brunnby Sk 060801 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf muricata 1 Lund Sk 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera cf muricata 2 Lund Sk 130627 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera curtiflora 1 Casa Grande N of Tucson, Arizona 130423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera curtiflora 2 Casa Grande N of Tucson, Arizona 130423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera curtiflora 3 Casa Grande N of Tucson, Arizona 130423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera curtiflora 4 Casa Grande N of Tucson, Arizona 130423 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera fruticosa 3 Lund Bot Garden 150713 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera gaura 1 Copenhagen Bot Garden 130625 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera kunziana Bergianska, Stockholm 050913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera lindheimeri 1 Bergianska, Stockholm 010831 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera lindheimeri 2 Bergianska, Stockholm 010829 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera missouriensis 1 Kungsmarken, Södra Sandby Sk 190617 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera muricata 1 Höllviken Sk 130622 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera muricata 2 Höllviken Sk 130621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera muricata 3 Höllviken Sk 130621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera pallida 1 Bergianska, Stockholm 050922 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perangusta 1 Ignaberga stn, Skåne 960712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perangusta 3 Ignaberga stn, Skåne 960712 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 1 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera perennis 2 (cult) Lund Sk 100701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 4 Metropolitan Parque, Santiago, Chile 171108 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 5 Metropolitan Parque, Santiago, Chile 171108 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 6 Metropolitan Parque, Santiago, Chile 171108 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera rosea 7 Metropolitan Parque, Santiago, Chile 171108 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera speciosa 2 Desert Botanical Garden, Phoenix, Arizona 130426 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera stricta 1 Haleakala, Maui, Hawaii 130716 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera versicolor 1 Copenhagen Bot Garden 120919 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Oenothera versicolor 2 Copenhagen Bot Garden 080710 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).