﻿452 
  Ever-sporting 
  Varieties 
  

  

  ing 
  circumstances, 
  and 
  if 
  growing 
  near 
  the 
  

   limits 
  of 
  such 
  regions 
  it 
  will 
  overlap 
  and 
  get 
  

   into 
  the 
  new 
  area. 
  All 
  other 
  species, 
  which 
  did 
  

   not 
  acquire 
  the 
  double 
  habit, 
  are 
  of 
  course 
  ex- 
  

   cluded, 
  with 
  such 
  curious 
  exceptions 
  as 
  those 
  

   of 
  Kaits. 
  The 
  typical 
  vegetation 
  under 
  such 
  

   extreme 
  conditions 
  however, 
  finds 
  explanation 
  

   quite 
  as 
  well 
  by 
  the 
  one 
  as 
  by 
  the 
  other 
  view. 
  

  

  Leaving 
  these 
  obvious 
  cases 
  of 
  double 
  adap- 
  

   tation, 
  there 
  still 
  remains 
  one 
  point 
  to 
  be 
  con- 
  

   sidered. 
  It 
  is 
  the 
  dwarf 
  stature 
  of 
  so 
  many 
  

   desert 
  and 
  alpine 
  plants. 
  Are 
  these 
  dwarfs 
  

   only 
  the 
  extremes 
  of 
  the 
  normal 
  fluctuating 
  va- 
  

   riability, 
  or 
  is 
  their 
  stature 
  to 
  be 
  regarded 
  as 
  

   the 
  expression 
  of 
  some 
  peculiar 
  adaptive 
  but 
  

   latent 
  quality? 
  It 
  is 
  as 
  yet 
  difficult 
  to 
  decide 
  

   this 
  question, 
  because 
  statistical 
  studies 
  of 
  this 
  

   form 
  of 
  variability 
  are 
  still 
  wanting. 
  The 
  ca- 
  

   pacity 
  of 
  ripening 
  the 
  seed 
  on 
  individuals 
  of 
  

   dwarf 
  stature 
  however, 
  is 
  not 
  at 
  all 
  a 
  uni- 
  

   versal 
  accompaniment 
  of 
  a 
  variable 
  height. 
  

   Hence 
  it 
  cannot 
  be 
  considered 
  as 
  a 
  necessary 
  

   consequence 
  of 
  it. 
  On 
  the 
  other 
  hand 
  the 
  dwarf 
  

   varieties 
  of 
  numerous 
  garden-plants, 
  as 
  for 
  in- 
  

   stance: 
  of 
  larkspurs, 
  snapdragon, 
  opium-pop- 
  

   pies 
  and 
  others 
  are 
  quite 
  stable 
  and 
  thence 
  are 
  

   obviously 
  due 
  to 
  peculiar 
  characteristics. 
  Such 
  

   characteristics, 
  if 
  combined 
  with 
  tall 
  stature 
  

   into 
  a 
  pair 
  of 
  antagonists, 
  would 
  yield 
  a 
  double 
  

  

  