XXII 
COMPARISON OF GENERA. 
Eastern U. S. 
Cook and Lake Co’s 
Genera. 
Genera, 
Percentages. 
Polypetalee 
340 
162 
48 
Gamopetalse 
379 
158 
42 
Total Dichlamydese 
719 
320 
45 
Monochlamydese (Apetalse) 
97 
46 
47 
Total Dicotyledons. . . . 
816 
366 
46 
Monocotyledons 
198 
103 
53 
Gymnosperms 
12 
4 
33 
Total Phaenogamia 
1026 
473 
46 
Cryptogamia 
39 
15 
38 
Totals 
1065 
488 
46 
The total number of genera in the first area is 1065; that of the second 488, or 
46 per cent. 
COMPARISON OF SPECIES. 
In the following table the twelve largest genera are compared: 
Eastern G. S. 
Species . 
Cook and Lake Co’s. 
Species. 
Percentages. 
Carex 
180 
70 
39 
Aster 
63 
31 
49 
Solidago 
61 
24 
39 
Polygonum 
27 
17 
63 
Salix. ..... 
23 
19 
83 
Helianthus 
27 
16 
59 
Viola 
24 
15 
63 
Ranunculus 
27 
14 
52 
Juncus 
38 
16 
42 
Cyperus .. . . . 
41 
12 
29 
Panicum 
36 
12 
33 
Asclepias 
22 
11 
50 
Here the genus Salix is the best represented, Viola ranking second. Seven 
reach 50 per cent, or more. 
