﻿New 
  Species 
  of 
  Oenothera 
  533 
  

  

  quently 
  almost 
  cordate, 
  the 
  laminae 
  themselves 
  

   varying 
  from 
  oblong-ovate 
  to 
  ovate 
  in 
  outline. 
  

  

  The 
  stems 
  are 
  often 
  quite 
  unbranched, 
  or 
  

   branched 
  only 
  at 
  the 
  base 
  of 
  the 
  spike. 
  Strong 
  

   secondary 
  stems 
  are 
  a 
  striking 
  attribute 
  of 
  the 
  

   lamarckiana 
  parent, 
  but 
  they 
  are 
  lacking, 
  or 
  

   almost 
  so 
  in 
  the 
  dwarfs. 
  The 
  stem 
  is 
  straight 
  

   and 
  short, 
  and 
  this, 
  combined 
  with 
  the 
  large 
  

   crown 
  of 
  bright 
  flowers, 
  makes 
  the 
  dwarfs 
  emi- 
  

   nently 
  suitable 
  for 
  bed 
  or 
  border 
  plants. 
  Un- 
  

   fortunately 
  they 
  are 
  very 
  sensitive, 
  especially 
  

   to 
  wet 
  weather. 
  

  

  Oenothera 
  gigas 
  and 
  0. 
  rubrinervis, 
  or 
  the 
  

   giant, 
  and 
  the 
  red-veined 
  evening-primroses, 
  are 
  

   the 
  names 
  given 
  to 
  two 
  robust 
  and 
  stout 
  spe- 
  

   cies, 
  which 
  seem 
  to 
  be 
  equal 
  in 
  vigor 
  to 
  the 
  

   parent-plant, 
  while 
  diverging 
  from 
  it 
  in 
  strik- 
  

   ing 
  characters. 
  Both 
  are 
  true 
  elementary 
  

   species, 
  differentiated 
  from 
  lamarckiana 
  in 
  

   nearly 
  all 
  their 
  organs 
  and 
  qualities, 
  but 
  not 
  

   showing 
  any 
  preponderating 
  character 
  of 
  a 
  

   retrograde 
  nature. 
  Their 
  differences 
  may 
  

   be 
  compared 
  with 
  those 
  of 
  the 
  elementary 
  

   species 
  of 
  other 
  genera, 
  as 
  for 
  instance, 
  of 
  

   Draba, 
  or 
  of 
  violets, 
  as 
  will 
  be 
  seen 
  by 
  their 
  

   description. 
  

  

  The 
  giant 
  evening-primrose, 
  though 
  not 
  taller 
  

   in 
  stature 
  than 
  0. 
  lamarckiana^ 
  deserves 
  

   its 
  name 
  because 
  it 
  is 
  so 
  much 
  stouter 
  in 
  all 
  re- 
  

  

  