Question
I got this potted aquarium plant (unmarked) from my local fish store a few weeks ago thinking it was Helanthium tenellum, but now that it's growing out a bit I'm not sure what it is.
Would anyone be able to help identify it?
Here you can see some of the root, going straight down:
I didn't plant this one deep enough in the substrate, so you can see its roots and stem:
Answer
The top picture I think is Najas guadalupensis; I cannot find anything else it could be.
The plant in the last picture might be Blyxa aubertii, though I am not sure about this one.
It looks like you have two different types of plants in your tank, the N. guadalupensis have many other names like guppy grass and waternymph.
Plant identification is hard as a result of the natural variation of where they grow.
Answered By - trond hansen