The White Mangrove (left image) is almost never submerged in water. They are low shrubs. The leaves have salt glands that you can see with the naked eye. On the leaf salt crystals may be visible.
The Red Mangrove (center image) stands in the water and is easy recognizable by its drop roots hanging down from the branches.
The red mangroves grow these drop roots because the underwater roots are not able to supply enough oxygen. Red mangroves can reach up to 24 meters high in ideal conditions. Most red mangroves you will see are around 6 meters. The bark is thick and grey to brownish.
The red mangrove produces pale pinkish to yellowish to whitish flowers. The seeds (rocket like) will already start growing while they are still attached to the tree. When they drop down, the water will carry them to new places where they can start growing.
You will find the Black Mangrove (right picture) in the tidal zone.
The black mangrove looks more like a normal tree and you will find them behind the red mangroves along the edges of the inner bays. To provide itself with enough oxygen the black mangrove found his own solution by growing aerial roots that grow upward from the soil. Like the red mangrove, the black mangrove has also white to pinkish to yellowish flowers and the seeds will grow on the branches. The seeds remain viable for at least one year after they fall from the tree.