40 



FLORA OF WASHINGTON AND VICINITY. 



Series, Classes, and Divisions. 



Pol.\-petalaB 



Gamopetalae 



Total Dichlamydea) . . 

 Monochlamydese 



Total Dicotyledons . . . 



Monocotyledons 



Gymnospermse (ConiferiB) 



Total Phfenogamia 



Cryptogamia 



Total "Vascular Plants 



Number of orders. 



Essex 

 County. 



Plora 

 Columbi- 

 ana. 



Number of genera. 



Essex 

 County. 



155 

 158 



313 



44 



Flora 

 Columbi- 

 ana. 



174 

 169 



343 



47 



Number of species 

 and varieties. 



Essex 

 County. 



I Flora 

 I Columbi- 

 ana. 



360 

 358 



356 

 389 



718 

 132 



745 

 124 



357 

 120 



7 



103 

 5 



112 

 4 



108 



484 

 20 



390 



112 



4 



506 

 21 



527 



850 



392 



17 



1,259 

 65 



869 

 331 



7 



1,207 

 42 



1,324 



1,249 



The 16 large orders enumerated on page 35 may also be compared with 

 profit : 



Orders. 



1 Compositaj 



2 Gramineas 



Cyperaceae 



4 ' Leguminosae 



5 Eosaceae 



6 Labiatae 



7 Cruciferae 



8 Scrophulariaceae 



9 Filices 



10 Ranunculaceae .. 



11 Ericaceae 



12 I Cupuliferae 



13 ' Orchidaceae 



14 j Liliaceae 



15 I Polygonaceae 



16 I UnibelliferaB 



Number of genera. 



Essex 

 County. 



43 

 50 



9 

 17 

 12 

 22 

 14 

 14 

 13 



9 

 18 



6 

 13 

 18 



3 

 16 



Flora 

 Columbi- 

 ana. 



Number of species 

 and varieties. 



Essex 

 County. 



Flora 

 Columbi- 

 ana. 



136 

 128 

 120 



39 



55 



35 



29 



29 I 

 40 



30 I 

 37 I 

 16 

 32 

 27 

 27 

 20 



149 

 110 

 108 

 57 

 46 

 42 

 33 

 32 

 30 

 27 

 26 

 26 

 24 

 24 

 23 

 22 



In the flora of Essex County the orders Umhelliferce (20) and Ctipu- 

 liferw (16) fall below the lowest of the 16 for the flora of Washington 

 {Umhelliferce^ 22), while on the other hand the Caryopliyllacece (27)^ 

 Salicacew (23), and Naiadacew (28), not in the list, rise above that num- 

 ber. These orders in the flora of Washington are represented respect- 

 ively by 19, 19, and 9 species and varieties. With reference to the last 

 named of these orders, however, it may be remarked that the genus 

 Potamogeton, which constitutes the greater part of it, has been very im- 

 perfectly studied here, and will certainly be largely increased when 

 thoroughly known. 



The orders in which this flora falls below that of Essex County are: 

 the Graminew^ Gyperacece, Bosacece, Filices, Rammculacea\ EricacecCy 

 Liliacea\ Orchidacecv, and Polygonacecv, nine in all. In the remaining 

 seven orders there is a greater number of species here than there. It is 



