03-05-2010, 11:04 AM
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Echinodorus argentinensis. Submersed it has leaves as you show in the last set of photos. I mistakenly took your earlier comment about long slender leaves as something much different, my fault for jumping to conclusions.
I also was a bit confusing in the photos; Echinodorus develop slightly different leaves under different light intensity as well, another reason why identification of species is tricky. Under more intense light, the leaves will be more like those in the photos I previously posted. Rataj in his recent revision of the genus (2004) has a photo identical to those I posted, but a drawing of a leaf like what you have photographed.
Anyway, I think we can safely assume it is Echinodorus argentinensis [Rataj 1970]. It was previously incorrectly named as E. grandiflorus var. ovatus, E. ellipticus or E. longistylis. Dr. Karel Rataj who has done more work on this genus than anyone, considers it one of the most beautiful aquarium plants. I've never found it locally.