03-31-2011, 10:02 AM
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That is what is commonly called a sword plant. The genus is Echinodorus, widespread over South America and some species extend up through Central America. It is a true aquatic, and in my view one of the best aquarium plants.
There are many species; the one generally seen in stores is probably Echinodorus bleherae
or Echinodorus amazonicus. Telling these two species apart (if they are separate, some say no) is difficult. Aquarium care is basically the same. You can find info on this plant in our profiles, click on the shaded name to see it. I won't repeat what's there, but it does need food (nutrients) and will grow larger depending upon actual species. You will also find out why the leaves changed, that is explained.