I picked up this plant yesterday from a small local pet shop. As usual, the boy attending the shop could not tell me the name, not even its local name. It had pale green leaves, and a thick stem without any roots. The stem is fibrous, soft and watery. Within a day, the top leaves turned into red, as shown in the picture. Probably, because of high light in my tank. It also has small purple flower buds.
Apparently, it looks like Ammannia gracilis or Nesaea crassicaulis, but weak and stressed due to the unhealthy conditions in the pet shop's dark, dumping tank. But I am not sure. I hope, it shows more of its original characteristics, as it regains its health in my 'test tank'.
It would be great if someone can help me to identify this plant!
The inset picture shows the top view of the same specimen.