While looking for a picture of blue-stemmed goldenrod (Solidago caesia) I ran across this stunning photo of its seeds.
Here they look like tiny parachutes, barely noticeable when on the plant.
Now I have something new to look for.
(photo by Steve Hurst at USDA-NRCS PLANTS Database via Wikimedia Commons. Click on the image to see the original)
I photographed this specimen in a local garden. “Goldenrod” is the nearest ID I’ve found to date.