Callitriche stagnalis; The Common Water-starwort is a species that is much more restricted to thermal areas than other water-starworts. It is most common in the south-western regions of Iceland. It can best be told from other sater-starworts by their floating leaves: the are rather round grouped in rosette-structures.
Traditionally water-starwort species have been classified in their own family: starwort family (Callitrichaceae) but recently they have been included in the plantain family (Plantaginaceae). The Icelandic name of this species is Lækjabrúða.