The Collaborative International Dictionary of English v.0.48:

Myrtales \Myrtales\ prop. n.
   A natural order of trees and shrubs including the myrtle
   family, Myrtaceae; Combretaceae; Elaeagnaceae;
   Haloragidaceae; Melastomaceae; Lecythidaceae; Lythraceae;
   Rhizophoraceae; Onagraceae; Lecythidaceae; and Punicaceae.

   Syn: order Myrtales, Thymelaeales, order Thymelaeales.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Myrtales
    n 1: Myrtaceae; Combretaceae; Elaeagnaceae; Haloragidaceae;
         Melastomaceae; Lecythidaceae; Lythraceae; Rhizophoraceae;
         Onagraceae; Lecythidaceae; Punicaceae [syn: Myrtales,
         order Myrtales, Thymelaeales, order Thymelaeales]