From The Collaborative International Dictionary of English v.0.44 [gcide]:
Umbelliferous \Um'bel*lif"er*ous\, adjective [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.
From WordNet (r) 2.0 [wn]:
adjective
1: relating to or belonging to plants of the family Umbelliferae
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