Sagittaria Subulata or Echinodorus Tenellus or other?

IME, it's the darker areas where Sag. sub grows tall. With good lighting it stays low. Spreads like soft butter on a warm day too.
 
I have C. Parva in my tank and it grows REALLY SLOW!!! Do not know why. I started with about 3 plants. I am up to 5!!!
 
AquariaCentral.com