The floating ferns of the Salvinia auriculata species group originate from tropical America but are also introduced in other parts of the world. This species group (agg. = "aggregate") includes the species S. auriculata, S. biloba, S. herzogii and S. molesta.
Floating fern sold under the name "Salvinia natans" normally belongs to the Salvinia auriculata group and is not Salvinia natans, an annual species of Europe, North Africa and Asia.
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<a href="https://www.flowgrow.de/db/aquaticplants/salvinia-auriculata-agg" target="_blank"><img alt="Salvinia auriculata agg." title="Salvinia auriculata agg." src="https://www.flowgrow.de/db/widget/aquaticplants/salvinia-auriculata-agg" /></a>
[widget=aquaticplants/salvinia-auriculata-agg]Salvinia auriculata agg.[/widget]