267 



Yitis, 23, 55, 66, 154, 197, 

 199, 201 , 202, 204, 205, 209, 

 229, 234, 235, 236, 238, 239, 

 247. 254. 



Yolkmannia , 195 . 



Yoivox, 25, 26. 



Yriesea, 108, 109. 



W alilenbergia , 127. 

 Wallisia, 252. 

 Weigelia, 127. 

 Weisia, 98. 

 Welwitschia . i3. 

 Wistaria, 142. 

 Wyethia, 102. 



Xanthium, 129, IJ 

 Xanthoceras , 149 . 

 Xanthorrhoea , 254. 

 Xerophyllum, 115. 

 Xerophyta , 110. 

 Xylographia , 51. 



Yucca, 113, 114, 115. 



Zamia , 104 . 



Zea, 14, 62, 203, 210, 232. 



Zignemaceae , 26 . 



Zingeberiaceae , 123 . 



Zurloa, 139. 



Zygopetalum, 117. 



