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: Webster's Revised Unabridged Dictionary (1913)