The Collaborative International Dictionary of English v.0.48:

creamcups \creamcups\ n.
   a California plant (Platystemon californicus) with small
   pale yellow flowers.

   Syn: Platystemon californicus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

creamcups
    n 1: California plant with small pale yellow flowers [syn:
         creamcups, Platystemon californicus]