542 



Rydberg: Notes on Rosaceae 



- The plant of northwestern North America is much closer to 

 the European Aruncus Aruncus, and differs practically only in the 

 long-acuminate leaflets. If any of the American species of Aruncus 

 should be reduced to the Old World species, it should be A. 

 acuminatus. A. Aruncus is common in cultivation and rarely 



escaped. 



To these four species is to be added an East Siberian species 



A. kamchalicus, which has been collected on Attn, the most 

 westerly of the Aleutian Islands. 



New York Botanical Garden. 







