The Collaborative International Dictionary of English v.0.48:

Cistus \Cistus\ n.
   a genus of small to medium-sized evergreen shrubs of southern
   Europe and northern Africa.

   Syn: genus Cistus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cistus
    n 1: small to medium-sized evergreen shrubs of southern Europe
         and North Africa [syn: Cistus, genus Cistus]