Water lilies are hydrophytic.    From Wordnet, Princeton University. 

Many of the shallow depressions or sinks, often called bays, dome swamps, or gum ponds, contain ponds or small lakes surrounded by cypress trees and other hydrophytic vegetation.    From Wordnik.com.  [Ecoregions of Florida (EPA)] Reference

It is true that sandy uplands have forests of loblolly and slash pine, and that baldcypress is a dominant tree in swamps; but such vegetation represents either xerophytic and hydrophytic forms in excessively dry or wet habitats, or second-growth forest following fire and deforestation.    From Wordnik.com.  [Outer Coastal Plain Mixed Forest Province (Bailey)] Reference