INDEX TO PART I. 



Walsura, 16 Xanthium, 132 



Waltheria, 94, 110 Xerophytes, 40, 4! 



nth, 152 Xylia, 16 



. 35, 36, 99 Xyridacese, 149, 1 



Wheat?™^' Yam family, 153 

 Wfld rose, 5, 55 



Williamsoniese, 82 ZingiberaceaJ, 154 



Willow family, 131 ; Zizyphus, 12 



