﻿Smithsonian 
  Report. 
  1943. 
  CocA 
  

  

  Guayule, 
  a 
  Rubber-Bearing 
  Desert 
  Shrub. 
  

  

  Upper, 
  bales 
  of 
  guayule 
  at 
  San 
  Luis 
  Potosi, 
  Mexico, 
  1902, 
  awaiting 
  shipment 
  to 
  Europe. 
  Lower, 
  left, 
  a 
  

   guayule 
  shrub, 
  reduced; 
  right, 
  a 
  basal 
  section, 
  natural 
  size. 
  A 
  low, 
  compact, 
  woody 
  shrub 
  scattered 
  

   through 
  high-altitude 
  desert 
  districts 
  in 
  northern 
  Mexico 
  and 
  in 
  the 
  Big 
  Bend 
  district 
  of 
  western 
  Texas. 
  

   Rubber 
  is 
  extracted 
  by 
  a 
  process 
  of 
  grinding, 
  retting, 
  and 
  flotation. 
  

  

  