We were intrigued by the mini-islands of yellow flowers in the lagoon; neither of us recognized them. Farther on, we passed large masses of them, mostly inaccessible.
Finally, one such expanse bordered the trail, so we were able to investigate.
I got down on my knees in the muck and bent the plants aside to see the growth pattern. Messy.
The flowers, from a couple of inches away.
Then I somehow misfiled the photos and tried to ID the flowers from memory, without success. Yesterday, looking for something else, I found them. (Isn't that always the way?) And then identifying them was easy; the flower heads looked like tansy, so I checked the entries next to the tansies in my book. There they were!
They're common brass buttons, Cotula coronopifolia. It's a semi-aquatic plant, colonizing beaches, tidal mudflats and marshes. It's an import from South Africa, and naturalized in BC., especially in this area. In spite of the extent of monopolization we saw in Reifel, it is not classified as invasive. So that's good; we can enjoy its beauty without the conflict of wishing it were not there.