The Collaborative International Dictionary of English v.0.48:

Palmae \Palmae\ prop. n.
   A natural family of chiefly tropical trees and shrubs; same
   as Palmaceae; coextensive with the order Palmales.

   Syn: family Palmae, Palmaceae, Arecaceae, family
        Arecaceae, palm family.
        [WordNet 1.5]