dwarf water lettuce but yes, exactly as he said, very cool looking plant too with big hydrophobic leaves. I'm bet if you asked real nice chem could be persuaded to ship some to you, I would but I've actually only got a few in my tanks right now because I'm working on carpeting these days and the tanks I have full of floaters would be over-run by them. They grow great and give nice texture to a tank.
I've played with lots of floaters by the way, frogbit you can see in some of the earlier pictures, it has thin roots that will actually hit the substrate and root for real. Its very cool for tanks that you don't want to "plant" heavily, it gives a kindof ethereal wispy look to the tank, I've got a friend that just has those a various crypts in a tank with the fancy white clouds that Jinkzd carries and its absolutely stunning, then there is salvinia which has small leaves and whispy short roots, I use it to cover up all of my smaller tanks that i'm not really trying to grow anything significant in (for instance it keeps that 20L multies tank more or less algae free despite the fact that there are only two anubias which are slow growing and hence basically useless for competing with algae). It also has hydrophobic leaves and gives really nice texture...then there is good old duckweed which has tiny root systems and is...weedy...idk...Salvinia>duckweed. Almost forgot, there is also red root salvinia which is pretty much epic, I've got that in the 10g that's all overgrown with the guppy grass and has the badidae.
This is that same tank about a year and a half ago with frogbit and salvinia...let me go grab you a picture of the waterlettuce
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