﻿MILKWEED 
  FAMILY 
  

  

  196 
  

  

  hood-like 
  appendages, 
  each 
  with 
  an 
  incurved 
  horn 
  borne 
  on 
  

   the 
  stamen 
  tube 
  and 
  forming 
  a 
  crown 
  around 
  the 
  stigma 
  

   (Fig. 
  27, 
  A); 
  anthers 
  pressing 
  against 
  the 
  lobes 
  of 
  the 
  stigma 
  ; 
  

   the 
  pollen 
  clinging 
  together 
  in 
  tough, 
  waxy 
  or 
  fine-grained 
  

  

  D 
  

  

  FIG. 
  27. 
  Flower 
  of 
  Asdepias 
  syriaca 
  

  

  E 
  

  

  A, 
  entire 
  flower; 
  B, 
  vertical 
  section; 
  C, 
  diagram; 
  D, 
  details 
  of 
  pollen-masses 
  

   and 
  glands, 
  ca, 
  calyx; 
  c, 
  corolla; 
  hd, 
  hood; 
  hn, 
  horn; 
  a, 
  anther; 
  s, 
  stig- 
  

   ma; 
  o, 
  ovary; 
  g, 
  gland; 
  p, 
  pollen-mass. 
  (All 
  considerably 
  enlarged.) 
  

  

  masses. 
  Ovary 
  free 
  from 
  the 
  calyx 
  tube, 
  of 
  2 
  carpels, 
  more 
  

   or 
  less 
  united 
  below 
  but 
  unconnected 
  above 
  ; 
  styles 
  2 
  ; 
  stigmas 
  

   5-angled 
  ; 
  ovules 
  several-many. 
  Fruit 
  consisting 
  of 
  1 
  or 
  2 
  

   po'ds. 
  The 
  flowers 
  are 
  very 
  highly 
  specialized 
  for 
  pollination 
  

   by 
  insects 
  (see 
  below, 
  under 
  Asdepias). 
  

  

  