﻿BUDS 
  AND 
  BRANCHES 
  

  

  105 
  

  

  the 
  leaf 
  into 
  the 
  stem. 
  In 
  dicotyledons 
  there 
  are 
  usually 
  

   about 
  as 
  many 
  such 
  dots 
  on 
  the 
  scar 
  as 
  there 
  were 
  principal 
  

   veins 
  in 
  the 
  leaf 
  or 
  leaflets 
  of 
  a 
  compound 
  leaf. 
  Why 
  ? 
  

  

  l-t.b 
  

  

  'sr. 
  

  

  All 
  

  

  .-C 
  

  

  c 
  

  

  6.8 
  

  

  FIG. 
  90. 
  Development 
  of 
  bark 
  on 
  cottonwood 
  branches 
  

  

  A, 
  young 
  twig 
  showing 
  terminal 
  bud 
  t.b, 
  leaf 
  buds 
  l.b, 
  and 
  leaf 
  scars 
  sc, 
  the 
  bark 
  

   being 
  almost 
  smooth 
  except 
  where 
  lenticels 
  appear 
  ; 
  B, 
  an 
  older 
  branch 
  in 
  longi- 
  

   tudinal 
  and 
  transverse 
  view, 
  showing 
  the 
  bark 
  c 
  as 
  it 
  begins 
  to 
  be 
  broken 
  and 
  

   ridged, 
  and 
  the 
  leaf 
  scar 
  sc; 
  C, 
  still 
  older 
  branch, 
  showing 
  the 
  bark 
  after 
  it 
  has 
  

   become 
  decidedly 
  ridged, 
  and 
  also 
  a 
  branch 
  scar 
  b.s. 
  

  

  