INDEX AND SUMMARY 



199 



23 ; hard bast, 23 ; internodes, 22 ; ' 

 medullary rays, 23; nodes, 22; 

 pith, 23; pollination, 95 ; rings, 23 ; 

 soft bast, 23 ; stem, 22 ; xylem, 23. 



Water Lily, flower, 107 ; seed dis- 

 persal, 125. 



White Hellebore, phyllotaxy, 41. 



Whorl, of cotyledons, 8 ; of leaves, 

 40. 



Willow, cuttings, 79; defoliation, 38 ; 

 longevity of leaf, 37 ; phyllotaxy, 

 153- 



Willow-herb, dichogamy, 171. 



Wind-pollinated flowers, Alder, 95; 

 Birch, 95; Butternut, 95; charac- 

 teristics of, 95 ; Corn, 95 ; Grasses, 

 95 ; Hickory Nut, 95 ; Nettle, 95 ; 



Oak, 95; Oat, 95; Plantain, 95; 



Rye, 95 ; Timothy, 95 ; Walnut, 95. 

 Wistaria, flower, 91 ; pods, 116. 

 Witch Hazel, buds, 48. 

 Wormwood, protection, 56. 



Xanthium, seed dispersal, 121. 

 Xanthium spinosum, protection, 156. 

 Xenogamy, 167. 



Xylem, Butternut, 23 ; Sunflower, 20 ; 

 Walnut, 23. 



Yam, bulblets, 78 ; climbing, 159 ; 

 seed dispersal, 123 ; vegetative re- 

 production, 78. 



Zygadenus, raceme, 101. 



