| A. retusus  LRM286,  Habitat 
      near Magdaleno Cedillo | 
| 
      A. retusus  LRM286, bearing 
large flowers in October. |  | 
      A. retusus  LRM286, with very 
      elongated tubercles. | 
    
      | Comments 
      Ariocarpus retusus at this site has much 
      in common with the long tubercled plants found further to the west at 
      Entronque Huizache. the plants reach a large size and are very large 
      flowered, the closest other population we have observed to these plants is 
      LRM276 at Pressa de Guadalupe, which is very different in appearance being 
      a typical short tubercled 'furfuraceus' type. |