I think this might be water smartweed (Persicaria amphibia), just from looking at the photo. I didn't wade into the water to get a really good look at it. This is near the north observation deck on the west side of Coot Slough at Celery Bog Park. The water level is high and these plants are standing in about 3-6 inches of water. Note the leaves are wider and flowering heads are wider and more erect than other smartweeds in this area. A synonym is Polygonum amphibium. Photos taken Sept. 16, 2014.
A photo of the smartweed showing the
standing-water habitat. Smartweed in the middle of the photo. Open
water is past the upper right of the photo.
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