A trip to a lake today, a man-made lake but it's been there for decades. It's a managed property, there is a bit of woods, reeds at water's edge, but also mown grass not far from the shore. A few wildflowers there, so here is the third I'd like to identify:
These white blooms grew all up the stems of the plant(s). They were tiny, probably no bigger around than a dime coin.