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Any idea gang? The one directly centered. Seems to be very sensitive to light intensity.

I think it looks like a Ludwigia too.Could it be a Eichhornia species? The lower stems do turn brown black over time, but the leaves do stay nice and light green.
How many leaves per node? Eichhornia diversifolia has alternate leaves. Yours appears to have opposite or whorled ones (much better pictures but it's still tough to count that). I think your answer is probably on page 376...Here are a few more pictures. COmapring to Kasselman on page 285, it is sure similar to the Eichhornia species.
Valid points. This is definitely not Eichhornia diversifolia.How many leaves per node? Eichhornia diversifolia has alternate leaves. Yours appears to have opposite or whorled ones (much better pictures but it's still tough to count that). I think your answer is probably on page 376...
Wow! The plant is in a 55 gallon tank with 260 watts of light!Looks like Nesaea pedicellata that's not getting a whole lot of light. Among other things, note the whitish look on the bottom of the leaves. Compare to the photo in the PF. You just don't see that on Ludwigia.
http://www.aquaticplantcentral.com/forumapc/plantfinder/images/Lythraceae/Nesaeapedicellata.jpg