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I used to have a plant many years ago when I was first starting out in the hobby. It was similar in appearance to hygro. polysperma, except the stem was more sturdy like Hygrophila corymbosa. The leaves were not quite as wide as corymbosa though. It used to grow quite well in low light (30 watts of regular fluorescent light with no CO2) no ferts. At the nodes I seem to remember a bit of a knot, or bulge, a little like a knuckle.

Anyone have any ideas what it might be? It is not in the plant finder.
 

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Our plantfinder shows three corymbosa varieties, and we are always looking for photos and descriptions of more. Kasselmann shows four in pictures, three in the text. There are probably more new forms coming in as collectors hunt new areas.
 

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Yup, what you see there are very young stems - when it grows out, node length will increase, and stem gets almost like a thin tree branch.

Stricta does the same thing, just with far wider leaves. I kept Stricta for a couple of years before finally giving it up for the space.
 
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