This Bacopa monnieri form has roundish leaves, in contrast to "standard" B. monnieri, whose leaves are longish-spatulate. It is exported by aquatic plant nurseries in Singapore.
The round-leaved form of B. monnieri is frequently used in Dutch-style tanks, but some years ago, Takashi Amano also planted it in some of his Nature Aquaria.
<a href="https://www.flowgrow.de/db/aquaticplants/bacopa-monnieri-rundblattrig" target="_blank"><img alt="Bacopa monnieri "Rundblättrig"" title="Bacopa monnieri "Rundblättrig"" src="https://www.flowgrow.de/db/widget/aquaticplants/bacopa-monnieri-rundblattrig" /></a>
[url=https://www.flowgrow.de/db/aquaticplants/bacopa-monnieri-rundblattrig][img]https://www.flowgrow.de/db/widget/aquaticplants/bacopa-monnieri-rundblattrig[/img][/url]
[widget=aquaticplants/bacopa-monnieri-rundblattrig]Bacopa monnieri "Rundblättrig"[/widget]