Sag filiformis is an interesting plant.. appropriate for ponds or aquariums.. It looks similar to a Aponogeton in many ways.. there is a definite rosette with Multiple stalks coming up and a elongate spoon leaf that floats on the water surface. They can commonly hold up to 15 leaves which in bright light w ill develop some red hues. Flowers come up on a stalk and are white and above the water surface. These dow ell in any light with no issues.
These are sold as single bare root plants.