THE AMERICAN BOTANIST 



71 



it cannot be positively demonstrated, the conditions under 

 which they occur lead to the strong presumption that if the 

 Washington list had been made before the country was settled, 

 about 11 of these would not have been found. Of the entire 

 list, Aruncus seems to have the clearest title to undisputed 

 citizenship in both regions. Cosmopolites such as Typha, 

 Polygomim, Potentilla and Brigeron may be looked for almost 

 anywhere and whether they are introduced or native at any 

 particular station is often impossible to determine. Although 

 the collector who emigrates to the West finds himself obliged 

 to make the acquaintance of an entirely new flora, it can still 

 be said of him"Coelum non animum mutat" ; for the strange- 

 ness of the new plant-environment only stimulates his desire 

 to become familiar with his new neighbors. — /. C. Nelson. 



