It's called "white mangrove" because it exudes extra salt through special glands which makes the leaves appear white. The word "mangrove"  refers to all types of trees that have adapted to living in the sea. Worldwide, there are 23 genera from eight different families that have species that are described as mangroves. Useful in coastal sites both for screening, windbreak, and as a plant useful to coastal stabilization. Plant slightly upslope of red and black mangroves.