A study was conducted on the stem anatomical characteristics of six selected Kerala mangrove species, which are representative of three genera in Rhizophoraceae. These anatomical features can be very useful in revealing the relationship between the plant species and its environment, and the results showed that some anatomical adaptations had occurred in response to extreme climate and exposed environment. These adaptations such as the presence of aerenchyma cells, cutinized epidermal cells and variations in the presence of parenchyma cells which occurred fairly uniformly among all the species studied.