LIST OF ILLUSTRATIONS. 
Frontispiece: Agave filifera filamentosa. 
ee Fo a a cee, Rene eee eae Facing page 7 
UPCuyer AIOGR SRO OE ae ee eee + co T9 
Cypripedium James K. Polk. ......... ae “ 20 
Plates 1-6, Diseases of Taxodium and Libocedrus Following page 78 
Plates 7-10, Speciesof Agave... ......., ey oF 
Plates 11-52, Species of Euphorbia. . .... . ee ‘e144 
Plates 58-58, Species of Lophotocarpus and Sagittaria wd “¢ 152 
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