The Collaborative International Dictionary of English v.0.48:

xerophyte \xe"ro*phyte\, n.
   A plant adapted for life with a limited supply of water;
   compare hydrophyte and mesophyte.

   Syn: desert plant, xerophytic plant, xerophile, xerophilous
        plant.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

xerophyte
    n 1: plant adapted for life with a limited supply of water;
         compare hydrophyte and mesophyte [syn: desert plant,
         xerophyte, xerophytic plant, xerophile, xerophilous
         plant]