REPORT OF THE STATE BOTANIST 1905 • 45 



Greenbush includes the hillsides east of Rensselaer and between 

 Nassau road on the south and the old red mill creek on the north. 

 It is divided into two parts by ^ ravine and small stream. 



Watorvliet is used to designate the hills and valley of Dry river 

 just we,''t of the city of Watervliet. It has not been thoroughly 

 explored, 



Lansingburg is a small area extending north from the car barns 

 about i mile and east from the Hudson river scarcely more than 2 

 furlongs. It is a small area but one rich in species. It contains 

 one species not yet found elsewhere, and two found in no other 

 place within the limits covered by this essay, 



Albia is used to designate a small strip of land lying between the 

 electric road and the Wynantskill creek about 2 furlongs south 

 of the Albia car station. 



Wynantskill designates a strip of land along the Sand Lake turn- 

 pike, beginning at the junction of the Poestenkill road and running 

 south about i mile. 



Sand Lake is used in this article to designate a comparatively 

 small part of the town of that name, lying near its center and about 

 10 miles east of Albany. One species is peculiar to this locality 

 and four are found in a single rocky pasture. 



Thompson Lake designates a narrow strip of territory lying along 

 the western and southeastern shore of the lake of that name. It 

 is about 18 miles in a direct line west from Albany, Crataegus 

 d i 1 a t a t a Sarg. occurs here, but is not known to be elsewhere in 

 our present limits. 



Hillsides, ravines and the margins of lakes and streams are 

 favorite habitats of species of Crataegus. Those in the immediate 

 vicinity of Albany grow for the most part in clayey soil. A few 

 grow apparently in sandy soil but in some places the sand forms a 

 thin stratum over clay and it is possible that the roots of the thorn 

 bushes may penetrate to the clay. In the Lansingburg locality 

 the soil is a shaly loam formed by the disintegration of Hudson 

 River shales. This soil is apparently very suitable to species of the 

 group Intricatae. All of the five species of this group known to 

 occur in our State are found here. One of these has yet been found 

 in no other place. 



The peculiar tendency of species of Crataegus to flock together 

 is strikingly illustrated in our territory. It is rare to find any 

 large area occupied by a single species. Where many thorn trees 

 and bushes grow together there are usually many species. A re- 

 markable example of this kind is foimd in a narrow strip of pasture 



