﻿Schaffner: 
  Diecious 
  nature 
  of 
  buffalo-grass 
  123 
  

  

  botanical 
  greenhouse. 
  Later, 
  single 
  individuals 
  were 
  transferred 
  

   to 
  pots, 
  great 
  care 
  being 
  taken 
  to 
  see 
  that 
  each 
  plant 
  in 
  a 
  pot 
  

   represented 
  a 
  single 
  seedling. 
  The 
  pots 
  were 
  placed 
  in 
  a 
  bed 
  

   in 
  the 
  greenhouse 
  some 
  distance 
  apart 
  and 
  the 
  plants 
  made 
  a 
  

   good 
  growth 
  during 
  the 
  summer 
  and 
  autumn 
  of 
  1918. 
  They 
  put 
  

   out 
  abundant 
  stolons 
  and 
  began 
  to 
  bloom 
  early 
  in 
  the 
  spring 
  of 
  

  

  ■ 
  

  

  19^9- 
  While 
  the 
  plants 
  were 
  in 
  the 
  greenhouse, 
  five 
  of 
  them 
  

   bloomed 
  and 
  all 
  were 
  pure 
  in 
  sexual 
  expression. 
  There 
  were 
  

   three 
  pure 
  carpellate 
  plants 
  and 
  two 
  pure 
  staminate 
  plants. 
  On 
  

   May 
  28, 
  1919, 
  these 
  five 
  plants, 
  together 
  with 
  eleven 
  others 
  in 
  

   pots, 
  were 
  transplanted 
  out 
  of 
  doors. 
  These 
  plants 
  made 
  a 
  re- 
  

   markable 
  growth 
  and 
  all 
  of 
  them 
  bloomed 
  before 
  the 
  end 
  of 
  the 
  

  

  + 
  

  

  summer. 
  Of 
  the 
  eleven 
  plants 
  which 
  bloomed 
  out 
  of 
  doors, 
  

   five 
  w^ere 
  carpellate 
  and 
  six 
  staminate. 
  There 
  were, 
  therefore, 
  

   exactly 
  eight 
  carpellate 
  plants 
  and 
  eight 
  staminate 
  plants. 
  None 
  

   showed 
  any 
  signs 
  of 
  moneciousness. 
  Two 
  other 
  plants 
  in 
  pots 
  

   were 
  kept 
  in 
  the 
  greenhouse 
  but 
  have 
  not 
  bloomed 
  up 
  to 
  the 
  

  

  * 
  

  

  present 
  time. 
  The 
  evidence 
  from 
  these 
  sixteen 
  plants, 
  each 
  grown 
  

   from 
  a 
  single 
  seed, 
  is 
  conclusive 
  that 
  Bidbilis 
  dactyloides 
  is 
  strictly 
  

   a 
  diecious 
  plant, 
  and 
  if 
  intermediates, 
  or 
  monecious 
  individuals, 
  

   ever 
  occur, 
  either 
  through 
  the 
  influence 
  of 
  environment 
  or 
  by 
  a 
  

   mutation, 
  they 
  are 
  to 
  be 
  looked 
  upon 
  in 
  the 
  same 
  light 
  as 
  other 
  

   intermediates 
  which 
  occur 
  in 
  many 
  normally 
  diecious 
  species. 
  

  

  The 
  writer 
  has 
  no 
  evidence 
  whatever 
  that 
  a 
  monecious 
  form 
  

   exists, 
  but 
  if 
  there 
  are 
  specimens 
  that 
  show 
  staminate 
  and 
  carpel- 
  

   late 
  inflorescences 
  on 
  the 
  same 
  stolon 
  or 
  that 
  show 
  staminate 
  and 
  

   carpellate 
  stolons 
  coming 
  without 
  question 
  from 
  the 
  same 
  in- 
  

   dividual, 
  the 
  fact 
  of 
  a 
  monecious 
  form 
  can 
  be 
  readily 
  determined. 
  

   The 
  writer 
  has 
  shown 
  elsewhere* 
  that 
  maleness 
  or 
  femaleness, 
  as 
  

   expressed 
  in 
  the 
  sporophyte 
  of 
  the 
  Anthophyta, 
  is 
  frequently 
  

   reversed, 
  and 
  such 
  a 
  reversal 
  is, 
  of 
  course, 
  theoretically 
  possible 
  

   in 
  the 
  buffalo-grass. 
  If 
  Hitchcock's 
  plant 
  was 
  monecious, 
  it 
  

   may 
  have 
  been 
  such 
  an 
  accidental 
  intermediate. 
  It 
  is 
  possible, 
  

   however, 
  that 
  two 
  seedlings 
  may 
  have 
  been 
  niis^akenJor_oi^ 
  

  

  '~^^^^:^^i^:^;rj^:^^i^nr^^^ 
  in 
  heterospuroua 
  

  

  sporophytes. 
  Ohio 
  Jour. 
  Sci. 
  i8: 
  101-125. 
  1918. 
  

  

  The 
  nature 
  of 
  the 
  diecious 
  condition 
  in 
  Morns 
  alba 
  and 
  SaUx 
  amy.da- 
  

  

  loides. 
  Ohio 
  Jour. 
  Sci. 
  19: 
  409-416. 
  ipiQ- 
  

  

  Complete 
  reversal 
  of 
  sex 
  in 
  hemp. 
  Science 
  II. 
  So: 
  31 
  i-3i2- 
  ^919. 
  

  

  