ii2 KEY TO GENERA AND SPECIES 



westward. (Fig. 211.) Crataegus pruinosa 

 (Wendl.) C. Koch. 



165. Fruit soft when ripe 166. 



166. Calyx lobes finely toothed. Stones usually 



4 or 5167. 



166. Calyx lobes toothed. Stones usually 3 or 4. 



Nova Scotia to the Great Lakes and south- 

 ward in the mountains. Crataegus macro- 

 sperma Ashe. 



167. Upper surface of the mature leaves smooth. 



R. I. to Montreal southward and westward. 

 Crataegus coccinioidcs var. dilatata (Sarg.) 

 Eggl. 



167. Upper surface of the mature leaves rough. 



Conn, to Del. and 111. Crataegus pedicillata 

 Sarg. 



168. Leaves broadest at the middle 169. 



168. Leaves broadest towards the base 170. 



169. Leaves broadly egg-shaped to round. Fruit 



less than inch thick. Stones I of an 

 inch long. Nova Scotia to Minn, and 

 southward in the mountains. Crataegus 

 rotundifolia Moench. 

 169. Leaves narrowly egg-shaped. Fruit more 



