﻿BAYBERRY 
  FAMILY 
  51 
  

  

  or 
  very 
  coarsely 
  toothed, 
  densely 
  white-downy 
  beneath. 
  Cultivated 
  

   as 
  a 
  shade 
  tree 
  and 
  sometimes 
  found 
  growing 
  spontaneously. 
  

  

  2. 
  P. 
  tremuloides 
  Michx. 
  AMERICAN 
  ASPEN, 
  QUAKING 
  ASP. 
  A 
  

   tree 
  20-60 
  ft. 
  high, 
  with 
  greenish-white 
  bark. 
  Leaves 
  roundish, 
  

   heart-shaped, 
  abruptly 
  pointed, 
  with 
  small 
  regular 
  teeth. 
  Leafstalk 
  

   long, 
  slender, 
  and 
  flattened 
  at 
  right 
  angles 
  to 
  the 
  broad 
  surfaces 
  of 
  

   the 
  leaf, 
  causing 
  it 
  to 
  sway 
  edgewise 
  with 
  the 
  least 
  perceptible 
  

   breeze. 
  Common 
  especially 
  N. 
  

  

  3. 
  P. 
  grandidentata 
  Michx. 
  LARGE-TOOTHED 
  POPLAR. 
  A 
  tree 
  

   60-80 
  ft. 
  high, 
  with 
  rather 
  smooth 
  gray 
  bark. 
  Leaves 
  3-5 
  in. 
  long, 
  

   roundish-ovate 
  and 
  irregularly 
  sinuate-toothed; 
  when 
  young 
  com- 
  

   pletely 
  covered 
  with 
  white 
  silky 
  wool, 
  which 
  is 
  shed 
  as 
  soon 
  as 
  the 
  

   leaf 
  matures. 
  The 
  petiole 
  is 
  somewhat 
  flattened, 
  but 
  not 
  nearly 
  as 
  

   much 
  so 
  as 
  that 
  of 
  the 
  preceding 
  species. 
  Rich 
  woods 
  N. 
  

  

  4. 
  P. 
  heterophylla 
  L. 
  SWAMP 
  POPLAR. 
  Branches 
  only 
  slightly 
  

   angled. 
  Leaves 
  ovate, 
  mostly 
  obtuse 
  at 
  the 
  apex, 
  rounded 
  or 
  sub- 
  

   cordate 
  at 
  the 
  base, 
  serrate 
  with 
  obtuse 
  teeth, 
  densely 
  woolly 
  when 
  

   young, 
  but 
  becoming 
  smooth 
  with 
  age 
  ; 
  petioles 
  cylindrical. 
  Pistil- 
  

   late 
  catkins 
  smooth, 
  erect 
  or 
  spreading, 
  loosely 
  flowered. 
  Capsule 
  

   ovoid, 
  usually 
  shorter 
  than 
  the 
  pedicel. 
  Common 
  in 
  river 
  swamps. 
  

   A 
  large 
  tree 
  with 
  soft 
  light 
  wood, 
  which 
  is 
  often 
  used 
  in 
  making 
  

   cheap 
  furniture.* 
  

  

  5. 
  P. 
  deltoides 
  Marsh. 
  COTTONWOOD. 
  A 
  large 
  and 
  very 
  rapidly 
  

   growing 
  tree, 
  75-100 
  ft. 
  or 
  more 
  high, 
  often 
  with 
  a 
  markedly 
  excur- 
  

   rent 
  trunk. 
  Leaves 
  large 
  and 
  broadly 
  triangular, 
  with 
  crenate-serrate 
  

   margins 
  and 
  long, 
  tapering, 
  acute 
  tips 
  ; 
  petioles 
  long 
  and 
  considera- 
  

   bly 
  flattened. 
  The 
  numerous 
  pediceled 
  capsules 
  are 
  quite 
  conspicu- 
  

   ous 
  when 
  mature, 
  and 
  the 
  air 
  is 
  filled 
  with 
  the 
  downy 
  seeds 
  at 
  the 
  

   time 
  when 
  the 
  capsules 
  open. 
  Common 
  W., 
  especially 
  along 
  streams, 
  

   and 
  planted 
  as 
  a 
  shade 
  tree. 
  

  

  15. 
  MYRICACE-S;. 
  BAYBERRY 
  FAMILY 
  

  

  Shrubs 
  with 
  alternate, 
  simple, 
  resinous-dotted 
  leaves 
  ; 
  monoe- 
  

   cious 
  or 
  dioacious. 
  Flowers 
  in 
  short, 
  bracted 
  catkins 
  ; 
  perianth 
  

   none. 
  Staminate 
  flowers 
  2-10, 
  stamens 
  hypogynous 
  ; 
  pistillate 
  

   flowers 
  surrounded 
  by 
  2-6 
  scales. 
  Ovary 
  1-celled 
  ; 
  style 
  short 
  ; 
  

  

  stigmas 
  2. 
  

  

  I. 
  MYRICA 
  L. 
  

  

  Shrubs 
  or 
  small 
  trees 
  with 
  the 
  branches 
  clustered 
  at 
  the 
  

   end 
  of 
  the 
  growth 
  of 
  the 
  previous 
  season. 
  Leaves 
  short- 
  

   petioled, 
  entire, 
  lobed 
  or 
  toothed, 
  the 
  margin 
  usually 
  revolute, 
  

  

  