Mystery Plant 3
 

This is some form of Vallisneria, judging by the roots and runners. I got a total of 21 plants stuffed into a tiny little plastic pot with no name on it. I'm hoping it's some form of dwarf val, but it may have been stunted by crowding in the pot. Longest leaf is approximately 8" and they are narrow leaves, and stiff.

MYSTERY PLANT 3

As the leaves are straight and not twisted even slightly, it is not the dwarf forms [Vallisneria americana and V. tortifolia] nor obviously the corkscrew [V. asiatica]. It is either V. gigantea or V. spiralis, both of which have straight leaves, the latter to 24 inches and the former to 39 inches.

A very similar looking plant is Sagitarria platyphylla, leaves to 8 inches. I mention this because it is near identical to your photo plant, at least from photos of each. I'm leaning towards vallisneria, but not with absolute certainty.

Byron.

Thanks Byron. I wanted to add there is something subtly different about the way the leaves come out of the base. Almost a fan arrangement as opposed to the more rounded look I'm used to with the corkscrew val in the other tank. Young shoots don't look the same either, they also have a fan shape. I hope it is a smaller plant! I used them as foreground hoping they would only grow to 8" ... we will see what they are after a while I guess.

Then it might be Sagitarria. I have a couple species of Sag and the leaves are stiff on the larger one (that looks much like your plant). B.

I actually think its Sagitarria, because of the ticker looking leaves, Vallis would be thinner. Plus it looks a AWFUL lot like the Sagitarria sitting in the tank behind me right now... :-)

I cut my Sagitarria plants outta some photo's from my 10&55g tank...compare yourself :-)

...now why did these pic's get so pixely !? I donno sorry man...hope you can see well enough

Yes I can see well enough. It does look like the ones I posted. there's that subtle difference in the way the leaves sprout, the sag seems to sprout leaves slightly higher up and more in a fan. Yep it looks like a sag. Now i guess I'll keep my fingers crossed it is a small variety and isn't a 32 foot long Sagitaria Anacondus or something... :)

Well I bought mine as "dwarf" which I am truthfully wondering about the definition of dwarf really cause its past 5" by now and does not appear to wanting to STOP growing...I do like how it built runners fairly quick thou, that ought to fill my "deck corner" in the 5g nicely.