﻿60 
  KEY 
  AND 
  FLORA 
  

  

  m. 
  QUERCUS 
  L. 
  

  

  Trees 
  or 
  shrubs 
  with 
  entire, 
  serrate, 
  or 
  lobed 
  leaves, 
  which 
  

   are 
  often 
  persistent. 
  Staminate 
  flowers 
  in 
  slender 
  catkins, 
  

   each 
  subtended 
  by 
  quickly 
  deciduous 
  bracts, 
  and 
  consisting 
  

   of 
  3-12 
  stamens 
  inclosed 
  by 
  a 
  4-8-parted 
  perianth, 
  often 
  

   containing 
  an 
  abortive 
  ovary. 
  Pistillate 
  flowers 
  solitary 
  or 
  

   in 
  small 
  clusters, 
  each 
  consisting 
  of 
  a 
  3-celled 
  ovary 
  with 
  

   2 
  ovules 
  in 
  each 
  cell, 
  though 
  rarely 
  more 
  than 
  1 
  ovule 
  

   matures 
  ; 
  styles 
  short, 
  erect, 
  or 
  recurved. 
  Pistillate 
  flowers 
  

   surrounded 
  by 
  a 
  scaly 
  involucre 
  which 
  at 
  maturity 
  becomes 
  

   a 
  cup 
  inclosing 
  the 
  base 
  of 
  the 
  fruit 
  or 
  sometimes 
  a 
  large 
  

   part 
  of 
  it. 
  Fruit 
  an 
  ovoid 
  or 
  subglobose, 
  1-seeded, 
  thin- 
  

   shelled 
  nut 
  (acorn). 
  

  

  A. 
  Fruit 
  annual; 
  leaves 
  not 
  bristle-tipped, 
  though 
  often 
  

   mucronate. 
  

  

  1. 
  Q. 
  alba 
  L. 
  WHITE 
  OAK. 
  A 
  large 
  tree 
  with 
  light 
  gray 
  bark. 
  

   Leaves 
  obovate-oblong, 
  3-9-lobed, 
  lobes 
  rounded 
  and 
  mostly 
  entire, 
  

   bright 
  green 
  above, 
  paler 
  below, 
  short-petioled. 
  Cup 
  hemispherical, 
  

   scales 
  rough, 
  woolly 
  when 
  young, 
  but 
  becoming 
  smooth 
  with 
  age 
  ; 
  

   acorn 
  oblong-ovate, 
  about 
  1 
  in. 
  long. 
  Common 
  in 
  damp 
  soil. 
  Wood 
  

   strong 
  and 
  durable 
  ; 
  one 
  of 
  the 
  most 
  valuable 
  timber 
  trees.* 
  

  

  2. 
  Q. 
  stellata 
  Wang. 
  POST 
  OAK. 
  A 
  tree 
  of 
  medium 
  size 
  with 
  

   rough 
  gray 
  bark. 
  Leaves 
  broadly 
  obovate, 
  deeply 
  lyrate-pinnatifid 
  

   into 
  5-7 
  rounded, 
  divergent 
  lobes, 
  upper 
  lobes 
  much 
  the 
  longer, 
  

   smooth 
  above, 
  yellowish-downy 
  beneath 
  ; 
  petioles 
  about 
  1 
  in. 
  long. 
  

   Cup 
  hemispherical, 
  nearly 
  sessile 
  ; 
  acorn 
  ovoid, 
  2-3 
  times 
  as 
  long 
  as 
  

   the 
  cup. 
  On 
  dry 
  soil. 
  Wood 
  hard 
  and 
  valuable. 
  

  

  3. 
  Q. 
  lyrata 
  Walt. 
  SWAMP 
  OAK. 
  A 
  large 
  tree 
  with 
  gray 
  or 
  red- 
  

   dish 
  bark. 
  Leaves 
  obovate-oblong, 
  deeply 
  pinnatifid, 
  lobes 
  narrow, 
  

   often 
  toothed, 
  thin, 
  smooth 
  above, 
  white, 
  densely 
  woolly 
  beneath. 
  

   Cup 
  round-ovate, 
  scales 
  cuspidate, 
  inclosing 
  nearly 
  the 
  whole 
  of 
  the 
  

   depressed-globose 
  a.corn. 
  On 
  wet 
  soil. 
  Wood 
  strong 
  and 
  very 
  durable.* 
  

  

  4. 
  Q. 
  macrocarpa 
  Michx. 
  BUR 
  OAK. 
  A 
  medium-sized 
  to 
  very 
  large 
  

   tree, 
  with 
  roughish 
  gray 
  bark. 
  Leaves 
  obovate 
  or 
  oblong, 
  lyrately 
  

   and 
  deeply 
  sinuate-lobed, 
  smooth 
  above, 
  pale 
  and 
  downy 
  beneath. 
  

   Cup 
  very 
  deep 
  and 
  thick, 
  abundantly 
  fringed 
  about 
  the 
  margin, 
  f 
  2 
  in. 
  

   in 
  diameter. 
  Acorn, 
  half 
  or 
  more 
  (sometimes 
  entirely) 
  inclosed 
  by 
  

   the 
  cup. 
  Reaches 
  its 
  full 
  size 
  only 
  on 
  rich 
  bottom 
  lands 
  S. 
  and 
  W. 
  , 
  

   where 
  it 
  becomes 
  one 
  of 
  the 
  finest 
  timber 
  oaks. 
  Wood 
  very 
  hard 
  

   and 
  heavy. 
  

  

  