WordNet (r) 3.0 (2006):

Tanacetum ptarmiciflorum
    n 1: shrubby perennial of the Canary Islands having white
         flowers and leaves and hairy stems covered with dustlike
         down; sometimes placed in genus Chrysanthemum [syn: dusty
         miller, silver-lace, silver lace, Tanacetum
         ptarmiciflorum, Chrysanthemum ptarmiciflorum]