It certainly looks like phalaris-arundinacea. The close up picture of the 'sheath' and 'ligule' at the leaf blade/stem junction is exactly like Arundinacea's. The reason you may be confused as to why the various P. Arundinacea pictures you've seen online sometimes appear different from each other is probably because there are several types of Phalaris-Arundinacea. Three sub categories being: Phalaris arundinacea L. var. picta
Phalaroides arundinacea (L.) Raeusch.
Phalaris arundinacea L. f. variegata (Parn.)
It's definitely apart of the "Pocea" family of grass. At least I'm very sure of that...
I agree that it's P. Arundinacea, however, I've never had any yields that type of grass. From what I've heard. Phalaris Arundinacea's spice content can vary from moderate amounts to almost no trace of spice. It's fickle in my opinion, but some people seem to have luck with it.
Peace
"We are all brilliant patterns intricately expressed in a tapestry of one thread." - SolarUnion