﻿542 
  Mutations 
  

  

  also 
  being 
  partly 
  united 
  with 
  one 
  another, 
  and 
  

   laterally 
  with 
  the 
  summit 
  of 
  the 
  style, 
  but 
  with- 
  

   out 
  detriment 
  to 
  their 
  function. 
  

  

  Young 
  seedlings 
  of 
  lata 
  may 
  be 
  recognized 
  by 
  

   the 
  very 
  first 
  leaves. 
  They 
  have 
  a 
  nearly 
  or- 
  

   bicular 
  shape 
  and 
  are 
  very 
  sharply 
  set 
  off 
  

   against 
  their 
  stalk. 
  The 
  surface 
  is 
  very 
  un- 
  

   even, 
  with 
  convexities 
  and 
  concavities 
  on 
  both 
  

   sides. 
  This 
  difference 
  is 
  lessened 
  in 
  the 
  later 
  

   leaves, 
  but 
  remains 
  visible 
  throughout 
  the 
  whole 
  

   life 
  of 
  the 
  plant, 
  even 
  during 
  the 
  flowering 
  sea- 
  

   son. 
  Broad, 
  sinuate 
  leaves 
  with 
  rounded 
  tips 
  

   are 
  a 
  sure 
  mark 
  of 
  0. 
  lata. 
  On 
  the 
  summits 
  of 
  

   the 
  stems 
  and 
  branches 
  they 
  are 
  crowded 
  so 
  as 
  

   to 
  form 
  rosettes. 
  

  

  Concerning 
  inheritance 
  of 
  these 
  characteris- 
  

   tics 
  nothing 
  can 
  be 
  directly 
  asserted 
  because 
  of 
  

   the 
  lack 
  of 
  pollen. 
  The 
  new 
  type 
  can 
  only 
  be 
  

   perpetuated 
  by 
  crosses, 
  either 
  with 
  the 
  parent- 
  

   form 
  or 
  some 
  other 
  mutant. 
  I 
  have 
  fertilized 
  

   it, 
  as 
  a 
  rule, 
  with 
  lamarckiana 
  pollen, 
  but 
  have 
  

   often 
  also 
  used 
  that 
  from 
  nanella 
  and 
  others. 
  In 
  

   doing 
  so, 
  the 
  lata 
  repeats 
  its 
  character 
  in 
  part 
  of 
  

   its 
  offspring. 
  This 
  part 
  seems 
  to 
  be 
  independ- 
  

   ent 
  of 
  the 
  nature 
  of 
  the 
  pollen 
  used, 
  but 
  is 
  very 
  

   variable 
  according 
  to 
  external 
  circumstances. 
  

   On 
  the 
  average 
  one-fourth 
  of 
  the 
  offspring 
  be- 
  

   come 
  lata, 
  the 
  others 
  assuming 
  the 
  type 
  of 
  the 
  

   pollen-parent, 
  if 
  this 
  was 
  a 
  lamarckiana 
  or 
  

  

  