﻿326 
  BOTANICAL 
  GAZETTK. 
  [ 
  December^ 
  

  

  less 
  frequently, 
  P. 
  hetero-phyllus 
  Schreb., 
  or 
  what 
  seems 
  to 
  

   be 
  that, 
  the 
  plant 
  being 
  of 
  very 
  large 
  size, 
  was 
  plentiful 
  in 
  

   some 
  places, 
  evidently 
  the 
  P. 
  granitnetis 
  Yri^^. 
  ^ 
  var, 
  maximm 
  

   Morong, 
  found 
  there 
  also 
  by 
  the 
  botanists 
  of 
  the 
  Minnesota 
  

   Survey 
  in 
  i886* 
  There 
  are 
  characters 
  which 
  ally 
  it 
  to 
  P. 
  

   Zizii, 
  and 
  it 
  appears 
  to 
  be 
  intermediate 
  in 
  its 
  characteristics. 
  

   It 
  approaches 
  in 
  size 
  P. 
  lucens, 
  the 
  stem 
  often 
  being 
  five 
  or 
  

   six 
  feet 
  long 
  when 
  the 
  water 
  is 
  deep. 
  They 
  are 
  also 
  very 
  

   branching 
  above, 
  and 
  with 
  leaves 
  exceedingly 
  numerous. 
  

   They 
  are 
  all 
  very 
  large 
  for 
  P. 
  heterophyllus, 
  except 
  some 
  of 
  

   the 
  floating 
  ones, 
  which 
  are 
  also 
  large 
  in 
  some 
  specimens, 
  

   and 
  with 
  long 
  slender 
  petioles 
  when 
  floating. 
  The 
  sub- 
  

   merged 
  leaves 
  are 
  rather 
  thin 
  in 
  texture, 
  tapering 
  below, 
  as 
  

   is 
  usual 
  in 
  the 
  species, 
  the 
  uppermost 
  lacking 
  the 
  coriaceous 
  

   and 
  shining 
  look 
  of 
  those 
  usually 
  found 
  on 
  stems 
  of 
  P. 
  Zizii 
  

   and 
  sometimes 
  P. 
  lucens. 
  The 
  fruit 
  is 
  also 
  uncommonly 
  

  

  _^„.v,,.iiii^o 
  A 
  . 
  ii^v^tua. 
  i 
  lie 
  11 
  uit 
  la 
  ai3u 
  ciiiv^v"" 
  . 
  

  

  large 
  and 
  when 
  mature 
  more 
  rugose 
  than 
  in 
  P. 
  heterophyllus 
  

   which 
  is 
  generally 
  smooth. 
  It 
  is 
  also 
  more 
  inclined 
  to 
  have 
  

   a 
  keel, 
  as 
  in 
  P. 
  lucens. 
  The 
  fruiting 
  spikes 
  are 
  an 
  inch 
  and 
  

   a 
  half 
  to 
  two 
  inches 
  long, 
  the 
  ripened 
  fruit 
  somewhat 
  scat- 
  

   tered. 
  In 
  typical 
  P. 
  heterophyllus 
  the 
  spikes 
  are 
  commonly 
  

   about 
  an 
  inch 
  long, 
  cylindrical 
  and 
  densely 
  fruited, 
  while 
  m 
  

   P. 
  Zizu 
  and 
  P. 
  lucens 
  they 
  are 
  more 
  as 
  in 
  these 
  specimens, 
  

   iong 
  and 
  with 
  fruits 
  more 
  lax. 
  The 
  var. 
  maximus 
  not 
  being 
  

   recognized 
  even 
  as 
  a 
  synonym 
  in 
  the 
  Revised 
  Manual, 
  there 
  

   IS 
  some 
  doubt 
  where 
  to 
  place 
  these 
  plants, 
  since 
  they 
  are 
  

   at 
  quite 
  a 
  remove 
  from 
  the 
  typical 
  species, 
  and 
  so 
  marked 
  as 
  

  

  to 
  deserve 
  some 
  distinction. 
  I 
  have 
  nowhere 
  seen 
  such 
  

  

  with 
  

  

  jarge 
  specimens 
  of 
  this 
  species, 
  though 
  finding 
  some 
  . 
  

   iong 
  alender 
  stems, 
  with 
  few 
  leaves, 
  in 
  the 
  small 
  lakes 
  m 
  

   western 
  New 
  York. 
  The 
  var. 
  graminifolia 
  often 
  has 
  an 
  

   e 
  ongated 
  stem, 
  but 
  not 
  branching 
  as 
  in 
  thfs 
  case, 
  ili^j 
  

   also 
  show 
  that 
  there 
  are 
  links, 
  quite 
  closely 
  connecting 
  ^^ 
  

   heterophyllus 
  and 
  P. 
  Zizii, 
  and 
  not 
  very 
  remotely 
  P- 
  lucent- 
  

   though 
  placed 
  in 
  a 
  different 
  section. 
  This 
  is 
  also 
  appare" 
  

  

  by 
  the 
  

  

  ng 
  of 
  P 
  

  

  synonym 
  of 
  the 
  same 
  species. 
  And 
  I 
  have 
  also 
  found 
  m 
  t^e 
  

  

  sha 
  lo,v 
  ponds 
  of 
  this 
  vicinity 
  P. 
  lucens 
  with 
  green 
  emeseC 
  

  

  eaves, 
  a 
  condition 
  that 
  may 
  to 
  some 
  degree 
  be 
  accidental 
  } 
  

  

  the 
  lessening 
  of 
  the 
  depth 
  of 
  water 
  w^here 
  they 
  grow 
  m 
  th 
  

   oner 
  seasnno 
  fi, 
  1 
  '^ 
  . 
  . 
  , 
  . 
  ,«■• 
  i 
  ■ 
  ., 
  •nrevent^ 
  

  

  Mich 
  

  

  at 
  thpr 
  ^^r 
  ^ 
  ^^^"t'^^n 
  stage, 
  the 
  water 
  being 
  mainu- 
  

   Vml 
  in 
  jV^ir'^^" 
  ^^^^ 
  ^y 
  ««4ing 
  through 
  the 
  sand, 
  or 
  

   ^^sing 
  and 
  falhng 
  with 
  the 
  winds 
  as 
  they 
  drive 
  the 
  wa^es 
  

  

  