The Collaborative International Dictionary of English v.0.48:

Leitneriaceae \Leitneriaceae\ prop. n.
   A natural family of trees coextensive with the genus
   Leitneria; commonly isolated in a distinct order.

   Syn: family Leitneriaceae, corkwood family.
        [WordNet 1.5] LEM

WordNet (r) 3.0 (2006):

Leitneriaceae
    n 1: coextensive with the genus Leitneria; commonly isolated in
         a distinct order [syn: Leitneriaceae, family
         Leitneriaceae, corkwood family]