I am posting this is here in the hopes that either 1) folks will happen to know what I have on my hands, or 2) they can direct me other resources for figuring it out.
A few months ago I was out walking in central Maryland on a tributary off the Patapsco river when I noticed a few patches of green in a very small stream. They stood out because this was November and there had already been a few frosts so almost everything else was brown. This is what I saw:
I took a few cuttings and brought them home. Here is what I had:
Here is what they look like planted in my tank:
I had done this to a lot of plants and frankly most didn't do well but these grew even though at the time this tank was low tech. Actually they grew really well, putting on about 1/4" of height a day once established.
This was 2 months ago. I have cut the tops and replanted these at least 3 times. Now this tank is high tech and predictably the plants are growing even better, putting on 1/2" of height a day when established.
They have also transitioned to a fully submerged form and look like this:
The leaves are big, about 2 inches long.
The plant is growing upright with a round stem. The leaves have very small serrations.
Does anyone know either what this is or another resource (like a plant forum) that I could use to get more help figuring it out?
Thank you folks for any help.