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BULLETIN OF THE 



those of other portions of the country, or from that of the country 

 at large. To institute comparisons with other local floras would of 

 course carry me much too far for the general purpose of this paper, 

 but it is both more interesting and more practicable to confront a 

 few of the above results with similar ones, drawn from a considera- 

 tion of a large part of the United States. For this purpose, as not 

 only most convenient but as least liable to embrace facts calculated 

 to vitiate the comparisons, I have chosen that portion of the United 

 States situated east of the Mississippi river, and for the most part 

 well covered by Gray's Manual of Botany for the Northern portion 

 and Chapman's Flora of the Southern States for the Southern. The 

 plants described in these works are conveniently collected into one 

 series by the second edition of Mann's Catalogue, published under 

 the supervision of the authorities at Cambridge, in 1872. Many 

 changes have since been made in the names, &c, and a few new 

 species added, but these are not sufficient to affect the general con- 

 clusions to be drawn from the following comparative tables. 



Comparison of Species and Varieties. 



The number of species and varieties of vascular plants enumer- 

 ated in the work above referred to is 4,034, of which the 1,249 of 

 the flora of Washington, by groups, is as follows : 



Polypetalae 



Gamopetalae 



Total Dichlamydeae_- 

 Monochlamydeae (Apetake). 



Total Dicotyledons. . 

 Monocotyledons (Endogens) 

 Gymnospernice 



Total Phaenogamia _. 

 Cryptogamia 



Total vascular plants 



Species and varieties 

 in the 



Eastern 

 U. S. 



1,115 



2,429 

 349 



2,778 



1,034 



28 



3,840 

 194 



4,034 



Flora 

 Columbiana. 



356 

 389 



745 

 124 



33i 



7 



1,207 

 42 



1,249 



Per 

 Cent. 



32 

 30 



3i 

 36 



31 

 3 2 



25 



3i 

 22 



3i 



