Foreivord 217 



of the Plan()rl)i(l;R' of the New World had never been c()mi)leted. In the 

 vohnninous long-hand notes which he left in unfinished fonn, there were 

 included the preliminary drafts of descriptions of many new species and 

 new varieties intended for incorporation in Part II. After it had been de- 

 cided that the plates for Part II should be included as an appendix to the 

 morphological studies, it was discovered that the legends for these plates 

 made frequent reference to previously unpublished specific and varietal 

 names. His manuscript descriptions for many of the new species and new 

 varieties were so well organized that there could be no doubt regarding 

 his intention. Consequently, liis jireliminary descriptions have been edited 

 and are included as a separate section of Part II. A few of the varieties 

 and species which he tentatively considered as new could not be found in 

 his files. For these it is assumed that he had never prepared definite de- 

 scriptions. In order to avoid nomenclatorial difficulties, these names have 

 been deleted to prevent their becoming nomina nuda. In each such in- 

 stance the undescribed and unnamed form has been referred to under its 

 proper genus as a questioned species or questioned variety. 



