WordNet (r) 3.0 (2006):

Begonia rex
    n 1: any of numerous usually rhizomatous hybrid begonias derived
         from an East Indian plant having rough-textured leaves
         patterned in silver and bronze and purple and red-brown
         with inconspicuous flowers [syn: rex begonia, king
         begonia, painted-leaf begonia, beefsteak geranium,
         Begonia rex]