368 



INTRODUCTION TO BOTANY 



Winged fruits and seeds, 170 



Winter buds, 94 



Winter spores of wheat rust, 254, 



255* 



Wood, coniferous, 108, 109* 

 Wood, fuel value of, 108 

 Wood, hard, 109, 110* 

 Wood, physical properties of, *107- 



110 

 Wood, structural advantages of, 107, 



108 

 Wood, structure of, 62*, 63*, 65*, 



109*, 110* 



Wood, tracheids of, 109* 



Wood fibers, 64 



Wood sections, 65*, 109*, 110* 



Xerophytes, 28, 29*, 80*, 81*, 82, 83 

 Yeast, 246* 



Zoospores, 227* 



Zygomorphic flowers, 128*, 129 



Zygospore, 224*, 225, 228 



