This is the kind of plant I’d look up starting with sedges. I think of sedges as funky marshy-land grass-like denizens. Maybe these cotton-top, stiff-stemmed plants?
I found out the other day that there are kinds of insects known as sedges—a new one on me. I got this from a fly-tying book on what the insects and the fishing-flies that imitate them look like—not actually how to tie them.
Later, I checked the big world of the internet, and found out that bug-sedges are what I have heard called caddis flies. Their wings fold into an inverted V making a lengthwise ridge above their backs.