posted 6 years ago
Jackie, I watched your video and the quick answer is I can't quite tell from it. Still photos would be better I think. From the video part of my thinks that it is in fact a true grass, and part of me thinks that its something just a bit grass like, such as an immature carnation. I think I see a grass seed head for a split second, then the camera moves. You say it isn't a true grass, and that is possible as well.
Since there does seem to be alot of it pull one up, look at the roots, and then take a number of still photos of it. If there is an flowering looking part at all photograph that carefully, photograph the stems, the leaf sheaths where they join the stems, the roots, any underground parts such as rhizomes or if it just has a clump of fibrous roots like an annual. I think if you post such still photos here you'll probably have an accurate answer quicker than I can reply myself.
Western Montana gardener and botanist in zone 6a according to 2012 zone update.
Gardening on lakebed sediments with 7 inch silty clay loam topsoil, 7 inch clay accumulation layer underneath, have added sand in places.