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]

WordNet (r) 3.0 (2006):

Palmae
    n 1: chiefly tropical trees and shrubs and vines usually having
         a tall columnar trunk bearing a crown of very large leaves;
         coextensive with the order Palmales [syn: Palmae, family
         Palmae, Palmaceae, family Palmaceae, Arecaceae,
         family Arecaceae, palm family]