Nymphaea alba 1 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 11 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 12 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 13 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 2 Copenhagen Bot Garden 140719 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 4 Lund Bot Garden 150612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 5 Lund Bot Garden 150612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 6 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 7 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 8 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 9 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba Ekebysjön, Danderyd 050816 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea amazonica x cruziana 1 Bergianska 010523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea amazonica x cruziana 2 Bergianska 010523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea candida 1 Tåssjö Sk 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea candida 2 Tåssjö Sk 130615 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea candida 3 Skärhamn, Bohuslän 120701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea candida 4 Skärhamn, Bohuslän 120701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea candida 5 Skärhamn, Bohuslän 120701 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea candida 6 Lohärad, Uppland 960812 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf cruziana 1 Lund Bot Garden 130921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf cruziana 2 Lund Bot Garden 130921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf cruziana 3 Lund Bot Garden 130921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf cruziana 4 Lund Bot Garden 130921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf cruziana 5 Lund Bot Garden 130921 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf stellata 1 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf stellata 2 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea cf stellata 3 National Tropical Botanical Gardens, Kalehua, Kauaii, Hawaii 130711 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea colorata 1 Bergianska 150527 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea gigantea Bergianska 010523 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea stellata Dept of Botany, Stockholm University 060403 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 1 Kermesaari Fi 120731 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 10 Kemijärvi, Lappland, Finland 220728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 11 Kemijärvi, Lappland, Finland 220728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 12 Kemijärvi, Lappland, Finland 220728 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 2 Kermesaari Fi 120731 (Jan Ingar Iversen Båtvik) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 3 Kermesaari Fi 120731 (Jan Ingar Iversen Båtvik) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 4 Kermesaari Fi 120731 (Jan Ingar Iversen Båtvik) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 5 Kermesaari Fi 120731 (Jan Ingar Iversen Båtvik) - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 9 Lake Ruzas SE of Dukstas, Lithuania 150804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 10 Lund Bot Garden 160628 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea alba 3 Lund Bot Garden 150612 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 6 Lake Ruzas SE of Dukstas, Lithuania 150804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 7 Lake Ruzas SE of Dukstas, Lithuania 150804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Nymphaea tetragona 8 Lake Ruzas SE of Dukstas, Lithuania 150804 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).