Curious where it was found? In nature? What country
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I have a similar plant that may be Hydrilla, although it was pulled out of Lake Gatun in Panama, it is feral here, but originally native to India.
Similar looking to Elodea, which is native to North America.
When I first pulled Hydrilla from the lake, it was in heavy, direct sun, and looked like this below.
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In my more shaded tank if is much less filled with leaves (1st pic above).
I have placed some now in my more highly lit tank, direct sun, leaves are filling in with more thickly (left side below) and the green is more intense.
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Elodea has 3 leaves per whorl, the leaves appear smooth, but are finely serrated.
Hydrilla has 3 to 8 leaves per whorl, and the leaves are serrated.
Egeria (native to Brazil) has 4 to 6 leaves per whorl, with smooth edges.