Plant ID?

[SubRosa]

I'll try these again. First one came as a hitchhiker on a Sarr I got from Meadowview a few years back. It gets small yellow flowers, (done for the season), and turns crimson in the fall. Second one was collected in 2" of water in a pond on the Outer Banks near Corolla. Gets small white flowers and turns ORANGE in the fall. Any ideas?

 

[theplantman]

Need closeups of flowers if you can get em. My very poor preliminary guesses are Hypericum spp. and something in Onagraceae for the second, possibly a Ludwigia spp.

 

[SubRosa]

Close-up pics are beyond my capabilities! Flowers on the second are white, 1/4" or less across with 4 petals. Flowers on the first are a golden yellow, about the same size as those on the other plant, and iirc have 5 petals.