6 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 efforts 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 80 species. 
Respectfully submitted 
CHaruges H. Peck 
Albany, Dec. 2, 1903 
