Hottonia palustris (in the center of the region Nord/Pas-deCalais, in the north of the France, on an old pond in forest (Natural regional parc of Scarpe-Escaut)
<a href="//commons.wikimedia.org/wiki/User:Lamiot" title="User:Lamiot">Lamiot</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>