b NEW YORK STATE MUSEUM 



and therefore the specimens from them are too incomplete to be 

 satisfactory. These places must be again visited earlier in the 

 season in order to get flowering specimens. Those who have made 

 a special study of these trees and shrubs and have recently pub- 

 lished many new species have given specific value to such charac- 

 ters as require a very complete set of specimens to make the 

 identification certain and satisfactory. There are also some 

 characters that are not well shown by the dried specimens and 

 in order to make these available notes must be taken of them at 

 the time the specimens are collected. The number of species 

 recently described is so great that it seems very probable that 

 mere varieties and perhaps mere forms have been in some cases 

 described as species. But error in this direction may have a ten- 

 dency to stimulate closer observation on the part of others in 

 their efiforts to recognize the fine distinctions made and may in the 

 end be productive of better results than error in the other direc- 

 tion would be. According to the present understanding of these 

 plants the number of species of Crataegus added to our flora is 

 19. They are specially noticed in a part of the report marked F. 



A supplementary list of plants of the Susquehanna valley is 

 marked G. It is composed of the names and annotations of 

 species detected since the previous list was written and of species 

 accidentally omitted from that list. It includes about 30 species. 



Kespectfully submitted 



Charles H. Peck 



Albany, Dec. 2, 1903 



