﻿30 
  

  

  INTROIUTTION 
  TO 
  I'.OTANY 
  

  

  other 
  common 
  plants 
  root 
  readily 
  in 
  water 
  and 
  grow 
  for 
  a 
  

   long 
  time 
  if 
  supplied 
  only 
  with 
  ordinary 
  river 
  or 
  wrll 
  water. 
  

   The 
  number 
  of 
  kinds 
  of 
  seed 
  plants 
  which 
  float, 
  and 
  therefore 
  

  

  FK:. 
  22. 
  Aerial 
  roots 
  (brace 
  roots) 
  of 
  corn. 
  Reduced 
  

  

  Note 
  that 
  the 
  s.-rirs 
  <i 
  and 
  '/ 
  ln^an 
  ;is 
  :n' 
  ; 
  rial 
  routs, 
  but 
  later 
  entered 
  the 
  ground 
  

  

  :ui'l 
  then 
  il.-veloprd 
  many 
  small 
  lu-anrlies. 
  Those 
  at 
  c. 
  if 
  not 
  checked 
  by 
  frost, 
  

  

  \\oiild 
  eventually 
  also 
  have 
  reached 
  the 
  ground 
  

  

  