Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

forsythia
     n : 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