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  KEY 
  AND 
  FLORA 
  

  

  The 
  flower 
  cluster 
  and 
  the 
  flower 
  of 
  a 
  sedge 
  may 
  be 
  under- 
  

   stood 
  from 
  an 
  inspection 
  of 
  Fig. 
  5. 
  

  

  The 
  species 
  are 
  even 
  more 
  difficult 
  to 
  determine 
  than 
  those 
  

   of 
  grasses. 
  

  

  FIG. 
  5. 
  Inflorescence, 
  flower, 
  and 
  seed, 
  of 
  a 
  sedge 
  

   (Great 
  Bulrush, 
  Scirpus 
  lacuxt 
  //.:) 
  

  

  A, 
  magnified 
  flower, 
  surrounded 
  by 
  a 
  perianth 
  of 
  hypogynons 
  bristles; 
  B, 
  the 
  

   seed 
  ; 
  C, 
  section 
  of 
  the 
  seed, 
  showing 
  the 
  small 
  embryo 
  inclosed 
  in 
  the 
  base 
  

   of 
  the 
  endosperm. 
  (After 
  Lindley) 
  

  

  6. 
  ARACE-ffi. 
  ARUM 
  FAMILY 
  

  

  Perennial 
  herbs, 
  with 
  pungent 
  or 
  acrid 
  juice. 
  Leaves 
  often 
  

   netted-veined. 
  Small, 
  unisexual 
  or 
  bisexual 
  flowers, 
  clustered 
  

  

  