FIGURE 2. 
Diagram showing relation of characteristic vegetation of Station 
VII. The zonal arrangement is notable. 
@ Typha latifolia. 
o Iris versicolor. 
A Sagittaria latifolia. 
Y Salix longifolia. 
C Crategus, Pyrus and Viburnum. 
O 
Quercus, Carya, Ostrya and Populus, the oaks predomi- 
nating. 
The vegetation is divided into a central area and more or less 
distinct concentric zones of plant societies (Fig. 2), which may be 
described as follows. 
(1). A nucleus of cattails, Typha lattfolza. 
(2). First zone, a wide expanse of reeds, Iris versicolor, inter- 
spersed with Sagittaria latifolia and Sparganium eurycarpum. 
(3). Second zone, consisting of bush-like trees, as follows. 
Crategus punctata. Large-fruited Thorn. 
Crategus tomentosa. Pear Thorn. 
Crategus coccinea. Scarlet Thorn. 
Pyrus coronaria. American Crab-apple. 
Viburnum lentago. Nanny-berry. 
Salix longifolia. River-bank Willow. 
