46 NEW YORK STATE MUSEUM 



land bordering the Erie canal near Menands. Here 10 species are 

 growing in an area of about i acre. The closest condensation of 

 numerous species that I have seen anywhere is near Albia where 

 nine of our native species are growing in a kind of irregular row 

 along the west bank of the Wynantskill creek. The length of the 

 row is about 100 feet. It is also worthy of remark that three of 

 these species, Crataegus ferentaria, C. rhombi- 

 folia and C. succulenta, belong to the group Tomen- 

 tosae. vSuch close associations of members of a single group as 

 this and the one at Lansingburg are very significant and when 

 more fully understood may possibly throw some light on the inter- 

 esting problem of the development of species. 



Rochester and its vicinity, with 41 species, are justly thought to 

 be unusually prolific in species of Crataegus, but Albany and its 

 vicinity surpass' even that rich Crataegus center in the number of 

 its known species. 



From the synoptic table here given, the range of each species 

 and the number of species in each locality can easily be ascertained. 



Crataegus tomentosa, which has not recently been 

 found in our limits, and Crataegus oxyacantha, which 

 is growing spontaneously in the North Albany locality, but which 

 is an introduced species, are omitted from the table. 



