Opiesilver was right, only the Myriophyllum aquaticum is commonly called Parrot's feather in US, I have plenty of it in outdoor pond. Don't think it likes to stay underwater for long, although I only tried it when I was a beginner.
The picture is very unclear, but definitely NOT M. mattogrossense(which is a real weed underwater, by the way, not as demanding as the book would lead you to believe). Keep in mind the first poster Anthony did not have a picture, and most probably asked about Myriophyllum aquaticum.
Flourite, wet/dry, AHSupply 302w PC, PinPoint controller
15w T6+15w T8
40w T6 ODNO4x, no CO2. Discus grow out.
10gallon Tonina tank, 2x15w T6 ODNO 4x
I will do aquascapes after I collect all the plant species and grow them to perfection.