The Collaborative International Dictionary of English v.0.48:

Floral \Flo"ral\, a. [L. Floralis belonging to Flora: cf. F.
   floral. See Flora.]
   1. Pertaining to Flora, or to flowers; made of flowers; as,
      floral games, wreaths.
      [1913 Webster]

   2. (Bot.) Containing, or belonging to, a flower; as, a floral
      bud; a floral leaf; floral characters. --Martyn.
      [1913 Webster]

   Floral envelope (Bot.), the calyx and corolla, one or the
      other of which (mostly the corolla) may be wanting.
      [1913 Webster]

WordNet (r) 3.0 (2006):

floral
    adj 1: resembling or made of or suggestive of flowers; "an
           unusual floral design" [syn: floral, flowered]
    2: relating to or associated with flowers; "floral organs"
    3: of or relating to the plant life in a particular region;
       "characteristic alpine floral elements"

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "floral":
   blooming, bloomy, blossoming, efflorescent, floreate, florescent,
   floriate, floriated, floricultural, florid, flowered, flowering,
   flowery, garden, horticultural, hortulan, in bloom, in blossom,
   in flower, inflorescent, multiflorous, radiciflorous, rhizanthous,
   uniflorous