Immigrant Trees 
Weeping Willow, Satix babylonica (Asia) ; White Mulberry, 
Morns alba (Europe and Asia) ; Paper Mulberry, Broussonetia 
papyrifera (Asia); Horsechestnut, Aesculus Hippocastanmn (Asia); 
Norway Maple, Acer platanoides (Europe and Caucasus); Paul- 
ownia, Paulownia lotnentosa (Japan); Ailanthus, Ailanthus gland- 
nlosa (China). 
Newcomers to America then, will find here a native flora thor- 
oughly consolidated in its occupancy of the natural undisturbed 
regions, and from its size and importance dominating the floristic 
tone of the country. Foreign plants, like all new arrivals, are 
often obliged at first to occupy less desirable sites; and, unlike 
the people, there seems no chance of their becoming assimilated 
into the native vegetation, as thousands of human immigrants 
have entered into the very core of material and spiritual America. 
Diagrams Showing Proportions of Native and Immigrant 
People and Plants 
Black represents foreign: white, native. 
The proportion of foreign and native born people in Greater New York. 
(From latest available census returns.) 
The proportion of foreign and native plants growing without 
cultivation near the City. 
(From Taylor’s "Flora of the vicinity of New York.”) 
The proportion of Old and New World food plants used here. 
(From De Candolle’s "Origin of Cultivated Plants.”) 
Let us consider next one contribution which foreign plants 
have made to America which is beyond price. No struggling 
5 
