Classification: 
Pinus monophylla Torr. & Frém. var. monophylla
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Kingdom Plantae – Plants  
 Subkingdom Tracheobionta – Vascular plants  
  Superdivision Spermatophyta – Seed plants  
   Division Coniferophyta – Conifers  
    Class Pinopsida –  
     Order Pinales –  
      Family Pinaceae – Pine family  
       Genus Pinus L. – pine  
        Species Pinus monophylla Torr. & Frém. – singleleaf pinyon  
         Variety Pinus monophylla Torr. & Frém. var. monophylla – singleleaf pinyon