One of the stem plants that can be used as a floating plant.
Leave the detached leaf on the surface to encourage root growth.
This can then be planted in the substrate when new roots appear...the older roots normally turn dark which indicates a good time for planting!
Grew it many many years ago. Water was liquid rock and lighting was tungsten filament 100W lamps. Photo period short due to cost. Grew best floating, broad pale green leaves with many daughter plant lets growing. When planted in substrate, plain gravel, the plant stated to shed its broad leaves and grow with narrow leaves. Submerged growth was poor compared with floating growth but it had to contend with a common plec, not so common back then.
I love this plant, it's a solid floating grower with lovely emergent growth. My betta loves it especially, it makes a great underwater ecosystem for the fish and shrimps. Fabulous plant for a quarantine tank I think.
I bought it as lace fern and it looks like in the photo. I also have what is supposed to be wisteria but it doesn't look like the photo at all. Maybe just different names for different countries or incorrectly sold.
Google has it named under several common names, water sprire, lace fern, swamp fern, Indian water fern.
Shows the need to call them by their botanical names.