Bacopa monnieri
Find more info here.

Also called smooth water hyssop (Bacopa monnieri)

The four stamens are fused to the petals in Bacopa monnieri
Find more info here.
Also called smooth water hyssop (Bacopa monnieri)
The four stamens are fused to the petals in Bacopa monnieri
Native to the Florida Keys (more info here)
Mecardonia procumbens flower and leaves
Mecardonia procumbens flower and bud side view