This is Rorippa nasturtium-aquaticum or Rorippa microphylla. I can't tell which one because the fruits were not mature. I've suggested the former because it seems to be much more common.
Both species have been renamed. Rorippa nasturtium-aquatium has reverted to Nasturtium officinale, and Rorippa microphylla now Nasturtium microphyllum. There is only one relatively recent (1995) record of Nasturtium microphyllum in the area.
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