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  INTRODUCTION 
  TO 
  BOTANY 
  

  

  Gynaecium 
  (female 
  household). 
  The 
  pistil, 
  or 
  collectively 
  the 
  pistils, 
  

   of 
  a 
  flower. 
  

  

  Halophyte. 
  A 
  plant 
  which 
  can 
  thrive 
  in 
  saline 
  soil, 
  as 
  that 
  of 
  "alkali 
  " 
  

   lands 
  or 
  salt 
  marshes. 
  

  

  Haustorium 
  (drinking 
  organs) 
  ; 
  pi. 
  haustoria. 
  The 
  absorbing 
  organs 
  

   of 
  some 
  parasites. 
  

  

  Heliotropism 
  (turning 
  to 
  light). 
  Tendency 
  of 
  plants 
  to 
  turn 
  toward 
  

   the 
  sun. 
  

  

  Heterogamy 
  (unlike 
  gametes). 
  The 
  condition 
  of 
  plants 
  whose 
  pairing 
  

   gametes 
  are 
  dissimilar. 
  

  

  Heterogamous. 
  Pertaining 
  to 
  heterogamy. 
  

  

  Heterospory 
  (unlike 
  spores). 
  The 
  condition 
  in 
  plants 
  which 
  produce 
  

   two 
  kinds 
  of 
  asexual 
  spores. 
  

  

  Heterosporous. 
  Pertaining 
  to 
  heterospory. 
  

  

  Homospory 
  (similar 
  spores). 
  The 
  condition 
  iu 
  plants 
  which 
  produce 
  

   but 
  one 
  kind 
  of 
  asexual 
  spore. 
  

  

  Homosporous. 
  Pertaining 
  to 
  homospory. 
  

  

  Host. 
  The 
  plant 
  upon 
  or 
  within 
  which 
  parasitic 
  plants 
  or 
  animals 
  

   develop, 
  and 
  from 
  which 
  they 
  obtain 
  nourishment. 
  

  

  Hybrid. 
  A 
  plant 
  which 
  is 
  the 
  offspring 
  of 
  an 
  egg 
  of 
  one 
  species 
  fer- 
  

   tili/ed 
  by 
  the 
  pollen 
  of 
  another 
  species. 
  The 
  term 
  is 
  also 
  used 
  for 
  crosses 
  

   between 
  two 
  varieties 
  of 
  plants. 
  

  

  Hydrophyte 
  (water 
  plant). 
  A 
  plant 
  thriving 
  only 
  in 
  water 
  or 
  marshes. 
  

  

  Hygroscopic 
  (moisture 
  seeking). 
  Having 
  an 
  avidity 
  for 
  water. 
  

  

  Hymenium 
  (a 
  membrane). 
  In 
  fungi, 
  a 
  surface 
  layer 
  of 
  interwoven 
  

   filaments 
  from 
  which 
  the 
  spore-bearing 
  filaments 
  arise. 
  

  

  Hypha 
  (awi-b); 
  pi. 
  hyphae. 
  The 
  slender 
  vegetative 
  filaments 
  of 
  fungi 
  

   which 
  may 
  or 
  may 
  not 
  be 
  woven 
  into 
  a 
  mat 
  (mycelium) 
  or 
  a 
  definitely 
  

   organized 
  plant. 
  

  

  Hypocotyl. 
  The 
  short 
  stem 
  of 
  an 
  embryo 
  seed 
  plant. 
  

  

  Hypodermis 
  (under 
  the 
  skin). 
  The 
  tissues 
  which 
  lie 
  immediately 
  

   beneath 
  the 
  epidermis 
  and 
  which 
  serve 
  to 
  strengthen 
  it. 
  

  

  Hypogynous 
  (being 
  under 
  the 
  ovary). 
  Applied 
  to 
  those 
  flowers 
  whose 
  

   stamens 
  and 
  floral 
  envelopes 
  are 
  at 
  the 
  base 
  of 
  the 
  ovary. 
  

  

  Indehiscent. 
  Not 
  dehiscent, 
  or 
  not 
  splitting 
  regularly. 
  

  

  Indusium 
  (covering); 
  pi. 
  indusia. 
  In 
  ferns, 
  a 
  cellular 
  outgrowth 
  of 
  

   the 
  leaf 
  covering 
  the 
  clusters 
  of 
  sporangia 
  (sori). 
  

  

  Inflorescence 
  (flowering). 
  The 
  arrangement 
  of 
  flowers; 
  or 
  the 
  flower- 
  

   ing 
  portion 
  of 
  a 
  plant. 
  

  

  Integument 
  (covering). 
  The 
  covering 
  of 
  the 
  ovule. 
  

  

  Intercellular. 
  Between 
  or 
  among 
  the 
  cells. 
  

  

  Internode. 
  The 
  part 
  of 
  a 
  stem 
  between 
  two 
  nodes 
  or 
  joints. 
  

  

  Intine 
  (on 
  the 
  inside). 
  The 
  inner 
  coat 
  of 
  a 
  pollen 
  grain. 
  

  

  