﻿54 
  KEY 
  AND 
  FLORA 
  

  

  long, 
  thick-shelled, 
  with 
  a 
  very 
  sweet 
  kernel. 
  Wood 
  hard 
  and 
  heavy. 
  

   Common 
  in 
  rich, 
  damp 
  soil 
  W. 
  

  

  4. 
  C. 
  alba 
  K. 
  Koch. 
  MOCKER 
  NUT, 
  WHITE-HEART 
  HICKORY. 
  A 
  

   large 
  tree 
  70-100 
  ft. 
  high, 
  with 
  close, 
  rough 
  bark 
  ; 
  catkins, 
  twigs, 
  

   and 
  under 
  surfaces 
  of 
  the 
  leaves 
  downy 
  and 
  resinous-scented 
  when 
  

   young. 
  Leaflets 
  7-9, 
  oblong-lanceolate 
  or 
  obovate-lanceolate, 
  taper- 
  

   pointed. 
  Fruit 
  globose 
  or 
  nearly 
  so, 
  with 
  a 
  very 
  thick, 
  hard 
  husk; 
  nut 
  

   with 
  4 
  ridges 
  toward 
  the 
  apex, 
  very 
  thick-shelled, 
  with 
  a 
  small, 
  sweet 
  

   kernel. 
  On 
  rich 
  hillsides. 
  Wood 
  much 
  like 
  that 
  of 
  C. 
  ovata. 
  

  

  5. 
  C. 
  cordiformis 
  K. 
  Koch. 
  PIGNUT, 
  SWAMP 
  HICKORY. 
  A 
  me- 
  

   dium-sized 
  tree, 
  with 
  rather 
  smooth 
  bark. 
  Leaflets 
  7-11, 
  lanceolate 
  

   or 
  oblong-lanceolate. 
  Fruit 
  not 
  large, 
  husk 
  thin 
  ; 
  nut 
  globular, 
  with 
  

   a 
  short 
  point, 
  very 
  thin-shelled 
  ; 
  kernel 
  extremely 
  bitter. 
  Moist 
  soil, 
  

   common 
  in 
  the 
  Middle 
  States. 
  

  

  17. 
  BETULACE^. 
  BIRCH 
  FAMILY 
  

  

  Trees 
  or 
  shrubs 
  with 
  alternate, 
  simple, 
  petioled 
  leaves, 
  with 
  

   usually 
  deciduous 
  stipules. 
  Flowers 
  mono3cious 
  in 
  cylindrical 
  

   or 
  subglobose 
  catkins. 
  Staminate 
  catkins 
  drooping 
  ; 
  flowers 
  

   1-3 
  in 
  the 
  axil 
  of 
  each 
  bract 
  ; 
  calyx 
  none 
  or 
  membranous 
  

   and 
  2-4-parted; 
  stamens 
  2-10, 
  distinct. 
  Pistillate 
  catkins 
  

   drooping, 
  spreading, 
  or 
  erect 
  and 
  spike-like 
  ; 
  flowers 
  with 
  or 
  

   without 
  a 
  calyx 
  ; 
  ovary 
  solitary, 
  1-2-celled 
  ; 
  ovules 
  1-2 
  in 
  each 
  

   cell. 
  Fruit 
  a 
  1-celled 
  nut 
  or 
  a 
  key.* 
  

  

  I. 
  CORYLUS 
  L. 
  

  

  Shrubs 
  with 
  prominently 
  veined, 
  cut-toothed 
  leaves, 
  which 
  

   are 
  folded 
  lengthwise 
  in 
  the 
  bud. 
  Flowers 
  expanding 
  before 
  

   the 
  leaves. 
  Staminate 
  flowers 
  in 
  slender, 
  drooping 
  catkins 
  ; 
  

   stamens 
  8, 
  anthers 
  1-celled. 
  Fertile 
  flowers 
  several 
  in 
  a 
  

   cluster 
  or 
  in 
  very 
  short 
  catkins 
  at 
  the 
  ends 
  of 
  the 
  twigs 
  of 
  

   the 
  season 
  ; 
  ovary 
  incompletely 
  2-celled; 
  style 
  short; 
  stigmas 
  

   2 
  ; 
  bractlets 
  2, 
  becoming 
  enlarged 
  and 
  inclosing 
  the 
  single 
  

   bony 
  nut 
  at 
  maturity.* 
  

  

  1. 
  C. 
  americana 
  Walt. 
  HAZELNUT. 
  A 
  shrub 
  2-5 
  ft. 
  high; 
  young 
  

   twigs 
  and 
  petioles 
  covered 
  with 
  brownish, 
  stiff 
  hairs. 
  Leaves 
  not 
  

   very 
  thin, 
  round-cordate, 
  acute 
  or 
  slightly 
  taper-pointed, 
  irregularly 
  

   toothed, 
  nearly 
  smooth 
  above, 
  downy 
  below. 
  Involucre 
  longer 
  than 
  

  

  