PHILOSOPHICAL SOCIETY OF WASHINGTON. 



95 



This table shows that in all the large genera except Solidago and 

 Cyperus, the District of Columbia has more than its full propor- 

 tion. The genus Salix is the one proportionally best represented, 

 while Polygonum, Desmodium, Panicum and Viola, each exceed 50 

 per cent. Quercus, Eupatorium and Asclepias are also well filled 

 out. 



As already remarked, it would carry us too far to undertake the 

 systematic comparison of our flora with those of other special local- 

 ities, even were the data at hand. Few local catalogues are con- 

 densed and summarized for this purpose and the labor of doing 

 this is very great. The recently published Flora of Essex County 

 Massachusetts, prepared by Mr. John Robinson, however, forms 

 something of an exception to this, and we may directly compare 

 the larger classes and also the orders. The following tables will 

 give an idea of the differences between that flora and our own : 



