﻿Taxonomic 
  Anomalies 
  675 
  

  

  known 
  to 
  produce 
  such 
  cups 
  from 
  time 
  to 
  time. 
  

   They 
  are 
  narrower 
  than 
  those 
  of 
  the 
  teasel, 
  but 
  

   this 
  depends, 
  as 
  we 
  have 
  seen 
  for 
  the 
  " 
  one- 
  

   leaved 
  ' 
  ' 
  ascidium, 
  on 
  the 
  shape 
  of 
  the 
  original 
  

   leaf. 
  In 
  other 
  respects 
  they 
  exactly 
  imitate 
  the 
  

   teasel 
  cups, 
  showing 
  thereby 
  how 
  these 
  cups 
  

   may 
  probably 
  have 
  originated. 
  

  

  In 
  numerous 
  cases 
  of 
  anomalies 
  some 
  acci- 
  

   dental 
  structures 
  are 
  parallel 
  to 
  specific 
  char- 
  

   acters, 
  while 
  others 
  are 
  not, 
  being 
  obviously 
  in- 
  

   jurious 
  to 
  their 
  bearers. 
  So 
  it 
  is 
  also 
  with 
  the 
  

   double 
  ascidia. 
  In 
  the 
  case 
  of 
  stalked 
  leaves 
  

   the 
  two 
  opposite 
  stalks 
  must, 
  of 
  course, 
  consti- 
  

   tute 
  a 
  long 
  and 
  very 
  narrow 
  tube, 
  when 
  growing 
  

   together. 
  This 
  tube 
  must 
  bear 
  at 
  its 
  summit 
  

   the 
  conical 
  ascidium 
  produced 
  by 
  the 
  two 
  con- 
  

   nate 
  limbs. 
  At 
  its 
  base 
  however, 
  it 
  includes 
  the 
  

   terminal 
  bud 
  of 
  the 
  stem, 
  and 
  frequently 
  the 
  

   tube 
  is 
  so 
  narrow 
  as 
  to 
  impede 
  its 
  further 
  de- 
  

   velopment. 
  By 
  this 
  contrivance 
  the 
  double 
  as- 
  

   cidium 
  assumes 
  a 
  terminal 
  position. 
  Instances 
  

   have 
  been 
  observed 
  on 
  magnolia, 
  in 
  Boehmeria 
  

   and 
  in 
  other 
  cases. 
  

  

  Flowers 
  on 
  leaves 
  are 
  of 
  rare 
  occurrence. 
  

   Notwithstanding 
  this, 
  they 
  constitute 
  specific 
  

   characters 
  in 
  some 
  instances, 
  accidental 
  anoma- 
  

   lies 
  in 
  others. 
  Helwingia 
  rusciftora 
  is 
  the 
  most 
  

   curious 
  and 
  best 
  known 
  instance. 
  It 
  is 
  a 
  

   little 
  shrub, 
  belonging 
  to 
  the 
  Cornaceae, 
  and 
  

  

  