The Collaborative International Dictionary of English v.0.48:

Casuarinales \Casuarinales\ n.
   an order of chiefly Australian trees and shrubs comprising
   the casuarinas, having only one family, Casuarinaceae.

   Syn: order Casuarinales.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Casuarinales
    n 1: order of chiefly Australian trees and shrubs comprising the
         casuarinas; 1 family: Casuarinaceae [syn: Casuarinales,
         order Casuarinales]