The Collaborative International Dictionary of English v.0.48:

Brasenia \Brasenia\ n.
   a magnoliid genus; a genus of dicotyledonous flowering plants
   regarded as the most primitive of extant angiosperms;
   alternatively, a member of the family Nymphaeaceae.

   Syn: genus Brasenia.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Brasenia
    n 1: alternatively, a member of the family Nymphaeaceae [syn:
         Brasenia, genus Brasenia]