﻿GLOSSARY 
  357 
  

  

  Unisexual. 
  Having 
  only 
  male 
  or 
  only 
  female 
  reproductive 
  organs. 
  

  

  Vein. 
  One 
  of 
  the 
  fibrovascular 
  bundles 
  of 
  leaves 
  or 
  of 
  any 
  flat 
  organ 
  

   of 
  plants. 
  

  

  Venation. 
  The 
  mode 
  of 
  vein 
  distribution. 
  

  

  Xerophyte. 
  A 
  plant 
  capable 
  of 
  thriving 
  under 
  conditions 
  of 
  strongest 
  

   transpiration 
  and 
  with 
  scanty 
  water 
  supply. 
  

  

  Xylem 
  (wood). 
  The 
  wood 
  (inner) 
  portion 
  of 
  the 
  fibrovascular 
  bundle. 
  

  

  Zoospore 
  (animal 
  spore). 
  A 
  motile 
  asexual 
  spore. 
  

  

  Zygomorphic. 
  Said 
  of 
  a 
  flower 
  which 
  can 
  be 
  bisected 
  by 
  only 
  one 
  

   plane 
  into 
  similar 
  halves, 
  bilaterally 
  symmetrical. 
  

  

  Zygospore 
  (yoke 
  spore). 
  The 
  spore 
  formed 
  by 
  conjugation 
  of 
  similar 
  

   gametes. 
  

  

  