I'm curious to see if you can name these two species. The one in the upper left portion of the first photo has opposite leaves about 6 mm long by 2 mm wide. There is one alternating flower/fruit in each set of leaf axils. If you open the larger pod shown in the second photo, there are several strongly curved fruits (kidney shaped) about 0.5 mm long by 0.1 mm wide.

That plant in the center of the first photo has roundish leaves that are about 1 cm long. I did not disturb that one, because I'm hoping that it will flower. Any chance that is Limnodium spongia (American Frogbit)?

The plant with linear leaves in the lower left portion of the first photo isn't a great example of the species, but appeared to be Potamogeton foliosus (Leafy Pondweed).

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