But so vigorous I wonder about Drosera X eloisiana. I didn't collect, and the petioles are not pubescent, but there is a good shot of the seeds. Both parent species are present in this bog. @threepogonias?
AKA Myosoton aquaticum. I was able to take a photo close enough to show this flower has five stigmas.
Polygala verticillata (whorled milkwort), Johnston, RI
An important find, as this was thought to be Historic in Massachusetts.