Rickett—The Larger Aquatic Plants of Lake Mendota. 523 
Table 9 
Percentage of Weight of Bach Species Found in Each Zone (From 
Talle 7) 
Zone... 
1 
2 
3 
Species..... 
Wet 
Dry 
Wet 
Dry 
Wet 
Dry 
Potamoaeton zosterifolius . 
16.6 
19.3 
83.4 
80.7 
P. pectinatus . 
75.4 
72.4 
19.2 
21.4 
5.4 
6.2 
P. amplifolius . 
3.4 
2.8 
47.5 
49.6* 
49.1 
57.6 
P. Richardsonii . 
59.3 
62.2 
33.1 
21.0 
7.6 
5.8 
P. lucens .. . 
100.0 
100.0 
Heteranthera dubia . 
47.7 
56.3 
52.3 
43.7 
Najas flexilis .. 
83.0 
85.8 
15.5 
12.8 
1.5 
1.4 
Vallisneria spiralis. . .... 
28.5 
28.9 
50.6 
50.7 
20.9 
20.4 
Ceratophyllum demersum .. 
5.9 
6.2 
71.4 
70.5 
22.7 
23.3 
Myriophyllum verticillatum . 
7.3 
6.5 
72.7 
73.6 
20.0 
19.9 
Ranunculus aquatilis .. 
100.0 
100.0 
Lemna trisulca . 
21.4 
23.6 
78.6 
76.4 
Chara crispa . 
53.7 
54.6 
46.3 
45.4 
All species.. 
30.9 1 
30.5 
44.6 
44.7 
24.5 
24.8 
