﻿Smithsonian 
  Report, 
  1943. 
  — 
  Cook 
  

  

  Plate 
  6 
  

  

  Seedling 
  Leaves 
  of 
  Castilla 
  Rubber 
  Trees. 
  

  

  Left, 
  a 
  seedling 
  plant 
  natural 
  size, 
  showing 
  subterranean 
  cotyledons 
  and 
  long 
  epicotyl. 
  Right, 
  above, 
  

   seedling 
  leaves, 
  lower 
  surfaces, 
  the 
  first 
  leaves 
  broadly 
  cordate, 
  the 
  second 
  leaves 
  oblong, 
  with 
  different 
  

   venation; 
  below, 
  two 
  Castilla 
  seedlings 
  in 
  4-inch 
  pots, 
  showing 
  that 
  first 
  leaves 
  are 
  opposite 
  and 
  have 
  

   rather 
  long 
  petioles. 
  

  

  