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]

The Collaborative International Dictionary of English v.0.48:

Diapensiaceae \Diapensiaceae\ n.
   a natural family of northern temperate low evergreen plants;
   in some classifications placed in its own order
   Diapensiales.

   Syn: family Diapensiaceae, diapensia family.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Diapensiaceae
    n 1: north temperate low evergreen plants; in some
         classifications placed in its own order Diapensiales [syn:
         Diapensiaceae, family Diapensiaceae, diapensia
         family]