Source : Webster's Revised Unabridged Dictionary (1913)

Umbelliferous \Um`bel*lif"er*ous\, a. [Umbel + -ferous: cf. F.
   ombillif[`e]re.] (Bot.)
   (a) Producing umbels.
   (b) Of or pertaining to a natural order ({Umbellifer[ae]}) of
       plants, of which the parsley, carrot, parsnip, and fennel
       are well-known examples.

Source : WordNet®

umbelliferous
     adj : relating to or belonging to plants of the family
           Umbelliferae