38 



FLORA OF WASHINGTON AND VICINIIY. 



parison of the species, 

 the following results : 



A comiiarison of the genera by groups gives 



Series, Classes, and Divisions. 



Genera repre- 

 sented in the— 



Polypetalfe.. 

 Gamopetalae. 



340 

 379 



174 

 169 



Total Dichlamydeae 



Monochlamydeae (AjHjtalae) 



Total Dicotyledons . 



Monocotyledons 



Gymnospermai 



Total Phjenogamia . 

 Cryptogamia 



51 

 45 



48 

 48 



48 

 57 

 33 



49 

 54 



Total Vascular Plants. 



1,065 



The percentages here range from 33 in the Gymnosperms to 57 iu the 

 Monocotyledons, averaging between 49 and 50, whereas in the similar 

 comparisons for species they ranged from 22 in the Cryptogams to 36 in 

 the JUonochlamydece. This result was to be expected, since as the groups 

 increase the number represented in any local flora should be proportion- 

 ately larger. For examifle, 116 orders out of the 156 are represented 

 here, which is upwards of 74 per cent. 



Comparison of Large Orders. 



It will be interesting to compare in a manner similar to the foregoing 

 the number of species in several of the largest orders. For this purpose 

 we may use the same orders mentioned on page 35 as the richest in 

 species of any belonging to this flora. The comparison may then be 

 shown as follows : 



Orders. 



Compositai 



Gramincai 



Cyperacea) 



Leguminosae 



Kosaceai 



Labiatai 



CruciferaB 



Scrophulariaco» 



Filices . . 



Kaniinciilacea) . 



Ericaccaj 



Cupiiliferaj ... . 



Orchidacea) 



LiliaceiP .. 



Polygonacca) ... 

 Umbelliferse 



