NOTES ON PLUM CULTURE. 
7 
ulus to further observations, we here reproduce a graphic 
tabulation of blossoming periods as given by Mr. J. W. Kerr 
of Denton, Maryland, in his trade catalogue. The same 
table is also given by Professor Waugh in the tenth report 
of the Vermont station. The latitude of Denton is very 
nearly that of Colorado Springs, but differences in altitude 
and climate make a considerable difference in the season of 
growth. The varieties are arranged in the table in the or- 
der of blossoming and it serves to show those blooming 
together as well as the earliest and latest bloomers. It will' 
be observed that the classes to which the varieties are 
referred embrace three not given in our list; Nigra, Wayland, 
and Watsoni. The first is separated from Prunus Ante^dcana 
and recognizes in the northeastern plums the variety nigra 
of that species. The Wayland group is separated from the 
Miner group, with which it has close affinities. The Watsoni 
group are varieties of Prunus Watsoni, a sand plum ranging; 
from Nebraska to Arkansas, and in the cultivated forms- 
closely resembling the Chicasaw varieties with which they 
are usually classed. 
