The Collaborative International Dictionary of English v.0.48:

Ariocarpus \Ariocarpus\ prop. n.
   1. 1 a genus of slow-growing geophytic cacti; northern and
      eastern Mexico; southern Texas.

   Syn: genus Ariocarpus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Ariocarpus
    n 1: slow-growing geophytic cacti; northern and eastern Mexico;
         southern Texas [syn: Ariocarpus, genus Ariocarpus]