I overlooked this plant a few times before I ended up collecting seeds and deciding to propagate it. It's not super duper showy, but dang the pollinators seem to love it, and the rhizomatous nature make it a really effective soil stabilizer.
 
Western fragrant goldenrod is a tall stemmy plant with teeny leaves topped by vivid yellow tufts of petals. It blooms late in the summer into the fall, and every time I've happened upon it the flowers are abuzz with pollinators of all kinds. It inhabits shorelines (stream, lake, river) and wants fairly reliable moisture, but beyond that it is tolerant of disturbance and not picky about soil.
 
If you are doing any kind of waterfront or ditch restoration/stabilization, this plant is your dude. Look at the photo: burned over forest and massive river in the background, euthamia all chill and thriving in the foreground. Pretty awesome, right?
 
It naturally co-occurs (in my experience) with wild mint, sneezeweed, plains coreopsis, blanketflower, indian hemp, wild chives, and canada goldenrod. However other good companions would be Eaton's aster, blue vervain, nuttall's sunflower, and hairy evening primrose.