WHAT FLORIDA NATIVE PLANT IS BLOOMING TODAY?: SAVANNAH PRIMROSEWILLOW (Ludwigia virgata)
One of 27 in the Ludwigia genus that is listed as native to the State of Florida according to ISB.
If you look really close you’ll see a tiny fly is pollinating.
Larval host for the Banded Sphinx Moth (Eumorpha fasciatus). These sometimes are called seedbox.
Native American Ethnobotany for this genus: http://herb.umd.umich.edu/herb/search.pl?searchstring=Ludwigia+virgata