The Collaborative International Dictionary of English v.0.48:

mangrove family \mangrove family\ n.
   A natural family (Rhizophoraceae) of trees and shrubs that
   usually form dense jungles along tropical seacoasts. It
   includes the mangrove Rhizophora Mangle.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

mangrove family
    n 1: trees and shrubs that usually form dense jungles along
         tropical seacoasts [syn: Rhizophoraceae, family
         Rhizophoraceae, mangrove family]