Not surprised. Even in the pictures of the cows, not really concentrating on the grasses, I could see several different sorts in the foreground. Couldn't name them, but they looked different. The evening pictures have amazing light. Is that your farm on the hill?
I wasn't sure about the cocksfoot down there but I had a look this evening and there is the odd bit. More in the Melbourne field, of which I took some pictures tonight but have yet to see how they've turned out...
There is some cocksfoot in that picture, but looking at the flower/seed heads there are several different types in some of the pictures. Not too easy to see in some, but certainly different types in the foreground of some of the pictures.