[HeyPK]

Without a doubt it is C. crispatula var. balansae. There is said to be a reddish variety and a greenish one, but the differences may be more to growing conditions than genetics. It is easy to grow. It likes hard water and some calcium carbonate such as bits of egg shell or snail shell in its rooting medium.

 

[HeyPK]

If they were grown in shallow moving water in full sun, they would tend to get short leaves and a lot of coloring. On the Santa Fe River there were Vallisneria growing under those conditions that had brown-red leaves only about four or five inches long. To see a picture, go to the following
http://www.aquatic-plants.org/gallery/album04/PC_Santa_Fe3.
I will find out in the next month or two how long the leaves will get under aquarium conditions.