﻿Retrograde 
  Varieties 
  133 
  

  

  from 
  time 
  to 
  time 
  in 
  sunny 
  and 
  sandy 
  localities. 
  

   I 
  have 
  isolated 
  it 
  and 
  cultivated 
  it 
  during 
  a 
  

   series 
  of 
  years 
  and 
  during 
  many 
  generations. 
  

   It 
  is 
  quite 
  true 
  to 
  its 
  character, 
  but 
  the 
  degree 
  

   of 
  its 
  coloring 
  fluctuates 
  between 
  pink 
  and 
  white 
  

   and 
  is 
  extremely 
  variable. 
  Perhaps 
  it 
  can 
  be 
  

   considered 
  as 
  an 
  inconstant 
  variety. 
  A 
  red- 
  

   flowered 
  form 
  of 
  the 
  common 
  Begonia 
  semper- 
  

   florens 
  is 
  cultivated 
  under 
  the 
  name 
  of 
  " 
  Ver- 
  

   non/ 
  the 
  white 
  hawthorn 
  (Crataegus 
  Oxya- 
  

   cantha) 
  is 
  often 
  seen 
  with 
  red 
  flowers, 
  and 
  a 
  

   pink-flowered 
  variety 
  of 
  the 
  " 
  Silverchain 
  " 
  or 
  

   " 
  Bastard 
  acacia 
  ' 
  (Robinia 
  Pseud-Acacia) 
  is 
  

   not 
  rarely 
  cultivated. 
  The 
  " 
  Crown 
  " 
  variety 
  

   of 
  the 
  yellow 
  wall-flower 
  and 
  the 
  black 
  varieties, 
  

   are 
  also 
  to 
  be 
  considered 
  as 
  positive 
  color- 
  

   variations, 
  the 
  black 
  being 
  due 
  in 
  the 
  latter 
  

   cases 
  to 
  a 
  very 
  great 
  amount 
  of 
  the 
  red 
  pigment. 
  

   Among 
  fruits 
  there 
  are 
  also 
  some 
  positive 
  

   red 
  varieties 
  of 
  greenish 
  or 
  yellowish 
  species, 
  as 
  

   for 
  instance 
  the 
  red 
  gooseberry 
  (Ribes 
  Grossu- 
  

   laria) 
  and 
  the 
  red 
  oranges. 
  The 
  red 
  hue 
  is 
  far 
  

   more 
  common 
  in 
  leaves, 
  as 
  seen 
  among 
  herbs, 
  in 
  

   cultivated 
  varieties 
  of 
  Coleus 
  and 
  in 
  the 
  brown- 
  

   leaved 
  form 
  of 
  the 
  ordinary 
  white 
  clover, 
  among 
  

   trees 
  and 
  shrubs 
  in 
  the 
  hazelnut 
  (Corylus), 
  the 
  

   beach 
  (Fagus), 
  the 
  birch 
  (Betula), 
  the 
  barberry 
  

   (Berberis) 
  and 
  many 
  others. 
  But 
  though 
  most 
  

   of 
  these 
  forms 
  are 
  very 
  ornamental 
  and 
  abun- 
  

  

  