XXI 
As Mr. Ward states, the last two are introduced rather as a means of con- 
trasting the eastern with the western portions of the continent than as a proper 
part of the comparative botanical statistics of the vicinity. 
The first four of the following tables form a comparison between our flora 
and that of the Eastern United States, showing the percentage of the former to 
the latter. Prominence is given to this section of the country, as it includes our 
district . 
COMPARISON OF DIVISIONS. 
Eastern U. S., 
Cook and Lake Co’s 
Percentages. 
Species and Y arieties 
Species and Varieties 
Polypetalae 
1115 
398 
36 
Gamopetalae 
1314 
431 
33 
Total Dichlamydeae. . . . 
2429 
829 
35 
Monochlamydeae (Apetalae) 
349 
122 
35 
Total Dicotyledons 
2778 
951 
34 
Monocotyledons 
1034 
333 
32 
Gymnosperms 
28 
7 
25 
Total Phasnogamia 
3840 
1291 
34 
Cryptogamia 
194 
31 
16 
Totals 
4034 
1322 
33 
The total number of species and varieties included in the Eastern United 
States is 4034, of which the 1322 plants of our flora form 33 per cent. 
COMPARISON OF FAMILIES. 
In the following table only such families are selected as have 26 or more 
species: 
Eastern U. S., 
Species and Varieties 
Cook and Lake Co’s 
Species and Varieties 
Percentages. 
Compositae 
497 
189 
38 
Cyperaceae 
357 
116 
32 
Gramineae 
297 
90 
30 
Leguminoseae 
208 
55 
26 
Rosaceae 
104 
49 
47 
Ranunculaceae 
80 
38 
48 
Scrophulariaceae 
97 
36 
37 
Labiatas 
121 
34 
28 
Cruciferas 
76 
34 
45 
Liliaceae 
82 
29 
35 
Orchidaceae 
71 
29 
40 
Umbelliferae ... 
63 
27 
43 
Polygonaceas ....... 
56 
26 
46 
