﻿Smithsonian 
  Report, 
  1943. 
  — 
  Cook 
  

  

  Plate 
  10 
  

  

  Leaves 
  and 
  Flowers 
  of 
  Normal 
  and 
  abnormal 
  Hevea. 
  

  

  Left, 
  from 
  a 
  normal 
  broad-leaved 
  tree; 
  right, 
  from 
  an 
  abnormal 
  narrow-leaved 
  tree, 
  both 
  natural 
  size. 
  The 
  

   development 
  of 
  a 
  narrow-leaved 
  tree 
  to 
  maturity 
  is 
  relatively 
  rare, 
  but 
  significant 
  in 
  the 
  study 
  of 
  variation. 
  

   The 
  flowers 
  of 
  Ilevea 
  are 
  pale 
  creamy 
  yellow 
  with 
  the 
  odor 
  of 
  lilacs, 
  to 
  which 
  the 
  Brazilian 
  name 
  seringa 
  

   or 
  seringueifa 
  may 
  refer. 
  

  

  