This narrow-leaved creeping Hygrophila, allegedly from South America, was identified by Dieter Wasshausen (Smithsonian Institution, Washington) as Hygrophila lancea, a species from Asia. It is widely spread among hobbyists in the USA, but only recently also in Europe.
To be continued...
<a href="https://www.flowgrow.de/db/aquaticplants/hygrophila-lancea-h-sp-araguaia" target="_blank"><img alt="Hygrophila lancea (H. sp. "Araguaia")" title="Hygrophila lancea (H. sp. "Araguaia")" src="https://www.flowgrow.de/db/widget/aquaticplants/hygrophila-lancea-h-sp-araguaia" /></a>
[widget=aquaticplants/hygrophila-lancea-h-sp-araguaia]Hygrophila lancea (H. sp. "Araguaia")[/widget]