What is this plant called?

I can't figure out what these plants are called. I bought one and propagated it-it was the only one in the shop. I'd love to know what it's called and what its scientific name is.

I'm referring to the ones with the central stalk and leafs radiating outward; the tallest plant in the picture.

Ozymandias said:

looks like Eichhornia Diversifolia or if not that a close relative. what are the spec of the tank it's in. had some and while it gew fast i had a hard time propagating it and the bottom of it would always die off

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The tank is a 9 gallon odyssea job called B9. I use an underpowered internal filter good for a five gallon tank by most standards. The ph is 6.4, temp. is 78ºF, substrate is 2.5 to 3 inches of river sand. Lighting is 18w PC, 10000K (I'd prefer 6500K but am stuck with this tube until I can find a new one)

odinthejd said:

I have no idea either and I want some also. You should trim some of for me and I'll pay for shipping.

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I could do that. How do we arrange this? I've never shipped anything living anywhere.
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Eichhornia Diversifolia is its name! I'm sure that if it's not E. Diversifolia then it must be in the same genus.

When I first got it, most of the leaves turned purple-black and melted. Then after a long touch-n-go period it recuperated and started growing. Lateral shoots appeared and I cut up the stem into separate chunks, each with a shoot , and planted them so I ended up with five plants plus the crown of the original, which rooted and resumed growth very quickly. I've also cut the top several inches off, leaving a stem with a couple of shoots, and root the top, ending up with three tops. Also, I've cut all but the bottom two inches off which forces the bottom to develop some shoots and I just replant the upper part. They develop rich root systems very quickly.

Literature says e. diversifolia requires a rich substrate. My substrate is coarse river sand which I never vacuum. The mulm disintegrates and sifts into the sand and is further mixed in by MTS, which I guess is why my plants thrive. I also squish excess pond snails and bury them deep in the sand. When I move a plant, I just cut it off at the roots and let the roots decay in the sand.