Rivina humilis
This one was a bit tricky, because the flowers normally have a pinkish tinge. This one was a very bright white. Plus, it has a long growing season here in the Keys, so I most often find the bright red berries forming simultaneously with new flowers. I’ll head back over to double check the fruit in a few days. This species is more common than its close relative, Guinea hen weed. Find more info here.

Rivina humilis flower

Rivina humilis flower

Raceme of Rivina humilis

In between flower and fruit. The sepals and stamens remain, but the petals are gone.