The Collaborative International Dictionary of English v.0.48:

Forsythia \For*syth"i*a\, a. [NL. Named after William Forsyth,
   who brought in from China.] (Bot.)
   A shrub of the Olive family, with yellow blossoms.
   [1913 Webster]

WordNet (r) 3.0 (2006):

forsythia
    n 1: any of various early blooming oleaceous shrubs of the genus
         Forsythia; native to eastern Asia and southern Europe but
         widely cultivated for their branches of bright yellow bell-
         shaped flowers