Source : Webster's Revised Unabridged Dictionary (1913)

Shasta daisy \Shasta daisy\
   A large-flowered garden variety of the oxeye daisy.

Source : WordNet®

shasta daisy
     n : hybrid garden flower derived from Chrysanthemum maximum and
         Chrysanthemum lacustre having large white flower heads
         resembling oxeye daisies; often placed in the genus
         Chrysanthemum [syn: {Leucanthemum superbum}, {Chrysanthemum
         maximum maximum}]