﻿H^ 
  BOTANICAL 
  GAZETTE. 
  [June, 
  

  

  hitherto 
  been 
  suspected. 
  It 
  is 
  not 
  mentioned 
  in 
  the 
  floras 
  of 
  

   these 
  sections 
  as 
  far 
  as 
  they 
  are 
  at 
  hand. 
  The 
  farthest 
  west 
  

   and 
  north 
  where 
  I 
  had 
  found 
  it 
  before 
  was 
  Cedar 
  Lake, 
  in 
  

   northern 
  Indiana. 
  As 
  it 
  is 
  known 
  to 
  occur 
  on 
  the 
  north 
  shore 
  

   ot 
  Lake 
  Superior 
  and 
  in 
  the 
  Rocky 
  Mountains 
  and 
  on 
  the 
  

   Pacific 
  slope, 
  it 
  is 
  probable 
  that 
  the 
  intervening 
  region 
  may 
  

   be 
  occupied 
  by 
  it, 
  and 
  that 
  it 
  will 
  ultimately 
  be 
  found 
  to 
  ex- 
  

   tend 
  across 
  the 
  continent. 
  It 
  is 
  easily 
  overlooked, 
  being 
  

   almost 
  always 
  completely 
  submerged, 
  and 
  if 
  the 
  water 
  is 
  not 
  

   clear 
  may 
  escape 
  detection. 
  I 
  have 
  sometimes 
  been 
  made 
  

   aware 
  of 
  its 
  presence 
  in 
  the 
  w^ater 
  onlv 
  by 
  dredging. 
  

   Wherever 
  seen, 
  it 
  proves 
  one 
  of 
  the 
  best 
  marked 
  and 
  least 
  

   variable 
  species 
  of 
  the 
  genus. 
  

  

  P. 
  heierofhylhis 
  Schreb., 
  under 
  two 
  extreme 
  forms 
  of 
  

   type, 
  was 
  collected. 
  It 
  is 
  extremely 
  variable, 
  and, 
  if 
  the 
  

   characters 
  were 
  based 
  on 
  foliage 
  alone, 
  one 
  might 
  think 
  he 
  

   had 
  found 
  two 
  different 
  species. 
  Two 
  of 
  the 
  gatherings 
  

   were 
  of 
  special 
  interest 
  on 
  account 
  of 
  the 
  variability 
  of 
  the, 
  

  

  Ke 
  

  

  One, 
  

  

  irom 
  pools 
  and 
  sloughs 
  near 
  the 
  northern 
  end 
  of 
  Portage 
  

   canal 
  has 
  large 
  floating 
  leaves, 
  some 
  of 
  them 
  i^ 
  inch 
  

  

  wide 
  by 
  Uinch 
  long, 
  and 
  i8-nerved. 
  Theleaves 
  of 
  the 
  species 
  

  

  usuaJly 
  end 
  in 
  a 
  short 
  mucro, 
  or 
  they 
  may 
  taper 
  to 
  an 
  abrupt 
  

  

  point 
  ending 
  in 
  a 
  mucro, 
  but 
  on 
  these 
  specimens 
  some 
  

  

  eaves 
  were 
  pointless, 
  complete 
  ellipses, 
  very 
  symmetrical 
  

  

  Ln!5 
  r\ 
  ^^■^/'f 
  ''"^ 
  apex 
  of 
  the 
  same 
  sKape. 
  I 
  have 
  

   tound 
  plants 
  with 
  leaves 
  of 
  similar 
  shape, 
  as 
  large 
  as 
  these 
  

  

  m„r,-n 
  T^^"' 
  }""} 
  ^^'^>' 
  ^" 
  possessed 
  the 
  characteristic 
  

   muc 
  10. 
  borne 
  of 
  these 
  plants 
  had 
  become 
  partly 
  terrestrial 
  

  

  thi. 
  In 
  J- 
  t'^'^"^ 
  "P' 
  ^^'^^^h 
  i« 
  frequently 
  the 
  case 
  with 
  

  

  Dro.t?nt 
  '^'; 
  ^ 
  ^t''^'''' 
  ^^'^' 
  ^^'^^^ 
  ^^ 
  ^^-et 
  Sana 
  or 
  mud, 
  with 
  

   crXled 
  in 
  r' 
  J-''l%'^ 
  '^-^ 
  ^"^^^^« 
  ^«"^' 
  the 
  leaver 
  being 
  

   of 
  1 
  fe 
  in 
  '" 
  ^'""i 
  °^'"^^ 
  ^^ 
  ^^^ 
  ^"^- 
  It 
  is 
  more 
  tenacious 
  

   the 
  stem 
  """"'^ 
  P?tamogetons, 
  which 
  commonly 
  perish 
  if 
  

   pools 
  Tnd 
  air 
  ^™^^«e^- 
  The 
  other 
  form, 
  found 
  in 
  

   e??minHV.?in 
  K 
  f' 
  •"u^"" 
  Calumet, 
  approached 
  the 
  var. 
  

  

  ioS 
  on 
  s 
  ' 
  TheT''^ 
  '''■'''' 
  ^"""'^^^ 
  '^^'^^ 
  ^^^ 
  '''^'' 
  

  

  acuminate. 
  

  

  ese 
  were 
  long, 
  narrow 
  and 
  acute, 
  or 
  mure 
  

   three 
  inrh^^ 
  1^"' 
  u,^?°^'^te 
  in 
  outline, 
  the 
  largest 
  nearly 
  

  

  portfoL 
  Thi 
  n%-^{ 
  ^ 
  ''^'^'^ 
  ''''^^^ 
  ^^^ 
  the 
  smaller 
  in 
  pro- 
  

   capered 
  in 
  .nn^h 
  ° 
  "' 
  'T" 
  ^^^« 
  ''^'y 
  ^°^g 
  ^^nd 
  slender. 
  All 
  

   ha^ 
  e 
  seen 
  the 
  "" 
  '^'^^'V^'-^t 
  the 
  mucro 
  had 
  disappeared. 
  I 
  

  

  a 
  lon/with 
  the 
  'T^ 
  '^??" 
  ^^ 
  ^^^^ 
  ^^ 
  Pl^^ts 
  near 
  ~ 
  " 
  

   aiong 
  ^Mth 
  the 
  ordinary 
  kind, 
  but 
  not 
  characterizin 
  

  

  Chicago 
  

   g 
  the 
  en- 
  

  

  ^ 
  

  

  