The Collaborative International Dictionary of English v.0.48:

Umbellifer \Um*bel"li*fer\, n. [NL. See Umbelliferous.] (Bot.)
   A plant producing an umbel or umbels.
   [1913 Webster]

WordNet (r) 3.0 (2006):

umbellifer
    n 1: any of numerous aromatic herbs of the family Umbelliferae
         [syn: umbellifer, umbelliferous plant]