Elatine alsinastrum 1 NE of Skalochori, Lesvos, Greece 100510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine alsinastrum 2 NE of Skalochori, Lesvos, Greece 100510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 1 Brusand, S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 10 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 11 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 2 Brusand, S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 3 Brusand, S of Stavanger, Norway 050805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 8 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 9 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 1 Yngsjö, Skåne 840830 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 10 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 10 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 11 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 12 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 12 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 13 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 13 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 14 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 2 mouth of the river Mörrumsån, Blekinge 110814 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 3 mouth of the river Mörrumsån, Blekinge 110814 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 4 mouth of the river Mörrumsån, Blekinge 110814 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 5 mouth of the river Mörrumsån, Blekinge 110814 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 7 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 8 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 9 mouth of Skräbeån, Gualöv Sk 210805 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine macropoda 1 N of Kalloni, Lesvos, Greece 100511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine macropoda 2 N of Kalloni, Lesvos, Greece 100511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine macropoda 3 N of Kalloni, Lesvos, Greece 100511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine macropoda 4 N of Kalloni, Lesvos, Greece 100511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine macropoda 5 N of Kalloni, Lesvos, Greece 100511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine macropoda 6 N of Kalloni, Lesvos, Greece 100511 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 1 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 2 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 4 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 5 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 6 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 7 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 8 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine alsinastrum 3 NE of Skalochori, Lesvos, Greece 100510 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 4 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 5 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 6 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hexandra 7 Tvorup Klitplantage, Jylland DK 230802 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 11 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine hydropiper 6 (ovary and seeds) mouth of the river Mörrumsån, Blekinge 110814 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Elatine triandra 3 Vuonoviken W of Haparanda, Norrbotten 220729 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).