﻿COMPOSITE 
  FAMILY 
  

  

  100. 
  COMPOSITE. 
  COMPOSITE 
  FAMILY 
  

  

  239 
  

  

  Flowers 
  epigynous, 
  in 
  a 
  dense 
  head, 
  on 
  a 
  common 
  recepta- 
  

   cle, 
  surrounded 
  by 
  an 
  involucre 
  composed 
  of 
  many 
  bracts 
  

   (Fig. 
  29), 
  with 
  usually 
  5 
  stamens 
  inserted 
  on 
  the 
  corolla, 
  

   the 
  anthers 
  united 
  into 
  a 
  tube 
  which 
  surrounds 
  the 
  style. 
  

  

  FIG. 
  29. 
  Flower 
  cluster 
  and 
  flowers 
  of 
  yarrow 
  

  

  A, 
  flower 
  cluster; 
  B, 
  section 
  of 
  flower 
  cluster; 
  C, 
  a 
  ray 
  flower; 
  D, 
  a 
  disk 
  

   flower, 
  a, 
  anthers 
  ; 
  ch, 
  chaff 
  of 
  disk 
  ; 
  d, 
  disk 
  flowers 
  ; 
  o, 
  ovary 
  ; 
  re, 
  corollas 
  

   of 
  ray 
  flowers 
  ; 
  s, 
  stigmas 
  ; 
  tc, 
  corolla 
  of 
  tubular 
  flower. 
  (A, 
  B, 
  C, 
  1 
  times 
  

   natural 
  size; 
  D, 
  18 
  times 
  natural 
  size) 
  

  

  Calyx 
  with 
  its 
  limb 
  sometimes 
  wanting 
  ; 
  when 
  present 
  taking 
  

   the 
  form 
  of 
  scales, 
  bristles, 
  etc., 
  known 
  as 
  pappus 
  (Fig. 
  30). 
  

   Corolla 
  either 
  strap-shaped 
  (Fig. 
  29, 
  re) 
  or 
  tubular 
  (Fig. 
  29, 
  tc); 
  

   in 
  the 
  former 
  case 
  often 
  5-toothed, 
  in 
  the 
  latter 
  usually 
  5- 
  

   lobed. 
  Style 
  2-cleft 
  above. 
  Fruit 
  an 
  akene, 
  often 
  provided 
  

   with 
  means 
  of 
  transportation. 
  This 
  is 
  the 
  largest 
  family 
  of 
  

   flowering 
  plants 
  and 
  among 
  the 
  most 
  specialized 
  for 
  insect 
  

  

  