The Collaborative International Dictionary of English v.0.48:

goldfields \goldfields\ n.
   A small slender woolly annual (Lasthenia chrysostoma) with
   very narrow opposite leaves and branches bearing solitary
   golden-yellow flower heads; it grows from Southwestern Oregon
   to Baja California and Arizona; -- it is often cultivated.

   Syn: Lasthenia chrysostoma.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

goldfields
    n 1: small slender woolly annual with very narrow opposite
         leaves and branches bearing solitary golden-yellow flower
         heads; southwestern Oregon to Baja California and Arizona;
         often cultivated [syn: goldfields, Lasthenia
         chrysostoma]