The Collaborative International Dictionary of English v.0.48:

Diapensiales \Diapensiales\ n.
   an order of plants, used in some classifications as
   coextensive with the family Diapensiaceae.

   Syn: order Diapensiales.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Diapensiales
    n 1: used in some classifications: coextensive with family
         Diapensiaceae [syn: Diapensiales, order Diapensiales]