The Collaborative International Dictionary of English v.0.48:

Iberis \Iberis\ n.
   A genus of Old World herbs and subshrubs including the
   candytuft.

   Syn: genus Iberis.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Candytuft \Can"dy*tuft`\ (k[a^]n"d[-e]*t[u^]ft`), n. (Bot.)
   An annual plant of the genus Iberis, cultivated in gardens.
   The name was originally given to the Iberis umbellata,
   first, discovered in the island of Candia (The Italian name
   for Crete). It is grown as an ornamental plant, having tufted
   red,violet, purple, or pink flowers.
   [1913 Webster]

WordNet (r) 3.0 (2006):

candytuft
    n 1: any of various flowering plants of the genus Iberis
         cultivated for their showy clusters of white to red or
         purple flowers; native to Mediterranean region