Here is another really great mangrove that I plan to use in my new brackish setup, white mangrove (Laguncularia racemosa). I currently have it going in my 11-4G riparium setup but it is growing fast and getting too big for that tank. It has these great paddle-shaped rubbery leaves.
I have been growing it all along in freshwater. It will need a slow adaptation period to adjust to brackish conditions.