Indeed S. Dulcamera!
HCC first set of grass photos is Festuca Arundinacea(contains b-carbs)
Second set is Dactylis Glomerata. The second one is very tricky, the reeds in the back almost made me think it was P. Arundinacea.
The main indicator is Dactylis has more of a "glume-barrier" to the lemma.
P. Arundinacea is simply a "V" encapsulating a seed. Dactylis are much more layered. Also, the spike or hair(awn) extending from the Dactylis glumes and lemmas are even more of an indicator as P. Arundinacea florets will not have this noticeable attribute.
Both have florets that are attached to branches and not the main stem(axis) of the inflorescence
Phalaris Arundinacea will have single-florets from the branches, whilst Dactylis Glomerata will have more than one.
Another huuuuuuge indicator as I've already mentioned with the pronounced awns on D. Glomerata would be that the glumes of D. Glomerata are never quite as long as the other florets. P. Arundinacea will have equal or longer glumes.(P. Arundinacea "V" encapsulating seed///Dactylis "Glume-barrier")
Keeper Trout in his Aya Analogues book on Erowid and SST posted pictures which probably are the main reason for falsely identifying P. Arundinacea.
Not saying his photos are not Arundinacea, they are, his photos are simply not definitive of the appearance of wild populations.
Arundinacea inflorescence can range in length from 3-8 inches so smaller ones throw it off a bit.
https://www.erowid.org/library/books_online/ayahuasca_apa/aya_sec3_part2_phalaris_species.shtml