The Collaborative International Dictionary of English v.0.48:

madder family \madder family\ n.
   A widely distributed natural family of mostly tropical trees
   and shrubs and herbs including coffee; chinchona; gardenia;
   madder; bedstraws; nd partridgeberry.

   Syn: Rubiaceae, family Rubiaceae, madder family
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

madder family
    n 1: widely distributed family of mostly tropical trees and
         shrubs and herbs; includes coffee and chinchona and
         gardenia and madder and bedstraws and partridgeberry [syn:
         Rubiaceae, family Rubiaceae, madder family]