XX 
* 
LARGE GENERA. 
The 18 largest genera selected are those having 8 or more species, and are 
arranged according to the number of species and varieties. 
Species. 
Varieties 
Carex 
55 
15 
Aster 
27 
4 
Solidago 
Polygonum 
Salix . . 
20 
15 
14 
4 
2 
5 
Helianthus 
14 
2 
Viola 
13 
2 
Potamogeton 
12 
2 
Ranunculus 
12 
2 
Juncus 
Cyperus 
11 
11 
5 
1 
Panicum 
11 
1 
Asclepias 
Habenaria 
10 
10 
1 
. 1 
Desmodium. 
10 
Hypericum 
9 
1 
Quercus 
Galium ...... 
9 
8 
2 
Less than 4 per cent, of the 488 genera contains 321 species and varieties, or 
24 per cent, of the entire number. 
COMPARISONS WITH OTHER FLORAS. 
For the purpose of showing the numerical relation which exists between the 
plant life of the territory represented by this Catalogue, and other localities ap- 
proximating to its area, the total number of species and varieties of their pheeno- 
gamia are given as follows : 
S. and Var. 
Flora of Cook County, Illinois, and Lake County, Indiana 1291 
Flora of Essex County 1257 
The Cayuga Flora 1278 
Plants of Oneida County. 1390 
Flora of Washington and Vicinity. ... 1211 
In order to bring out some interesting facts with regard to the relation of our 
flora to the vegetable life of different sections of the United States, the plan laid 
down by Ward, in his Flora of Washington and Vicinity, has been followed to 
some extent. In the Flora referred to, comparisons are made between its system- 
atic distribution, orders, genera and species, and those of the Eastern United 
States. As a “final statistical exhibit, more comprehensive in its scope,” Mr. 
Ward gives a table in which the divisions are reduced to a common standard, 
which is done by taking the percentage which each division bears to the total of 
the flora specified. By following this method, the rank of each group is obtained 
relative to those of the several floras compared. (See fifth and sixth tables.) 
The areas taken into consideration are: 
1. Flora of Cook County, Illinois, and Lake County, Indiana. 
2. Illinois State Report (Patterson). 
3. Flora of the Northeastern United States. 
4. Flora of the Southeastern United States. 
5. Flora of the Eastern United States. 
6. Plants collected by the 40th parallel survey. 
7. Plants collected by Lieutenant Wheeler’s survey. 
