The Collaborative International Dictionary of English v.0.48:

dillenia \dillenia\ n.
   any of several evergreen trees or shrubs of the genus
   Dillenia grown for their foliage and nodding magnolialike
   flowers which are followed by fruit that is used in curries
   and jellies and preserves.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

dillenia
    n 1: any of several evergreen trees or shrubs of the genus
         Dillenia grown for their foliage and nodding flowers
         resembling magnolias which are followed by fruit that is
         used in curries and jellies and preserves