STATISTICAL SUMMARIES 



In the following summaries varieties and hybrids are counted with 

 species. When, however, in Tables II and III the numbers are the 

 same, precedence in the list is given to the family or genus having the 

 fewer varieties and hybrids. The summaries include the species recog- 

 nized in the list of "Additions and Corrections." 



I. NUMBERS AND SYSTEMATIC DISTRIBUTION OF SPECIES 



Pteridophytes 

 Spermatophytes 



Totals 



962 



278 



1240 



II. 



DISTRIBUTION OF SPECIES AND VARIETIES AMONG THE 

 PRINCIPAL FAMILIES 



INCLUDING ALL HAVING 15 OR MORE SPECIES 



Genera 



Species and varieties 



