Tall rushes, over our heads.
And this: look closely. Can you find the moth? These were all through the weeds. Flying, they were white. Parked, they disappeared.
Give up? Here it is:
I couldn't get any closer; it flew away, just a few feet, and became invisible. I'd love to get another look at that topknot.
And now, if you'll excuse me, I have several hours of work to do, looking at all the small white moths on BugGuide.
Update: According to Bob Patterson at BugGuide, it is possibly Crambus leachellus, Leach's Grass-veneer. The "topknot" is a snout; the Crambidae are snout moths.