The Collaborative International Dictionary of English v.0.48:

Cruciferae \Cruciferae\ n.
   a natural family of plants with four-petaled flowers; the
   mustard family.

   Syn: family Cruciferae, Brassicaceae, family
        Brassicaceae, mustard family.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cruciferae
    n 1: a large family of plants with four-petaled flowers;
         includes mustards, cabbages, broccoli, turnips, cresses,
         and their many relatives [syn: Cruciferae, family
         Cruciferae, Brassicaceae, family Brassicaceae,
         mustard family]