The Collaborative International Dictionary of English v.0.48:

Leitneria \Leitneria\ prop. n.
   A genus of trees or shrubs coextensive with the family
   Leitneriaceae, and including the corkwood (Leitneria
   floridana).

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

WordNet (r) 3.0 (2006):

Leitneria
    n 1: one species: corkwood [syn: Leitneria, genus Leitneria]