463 
fall it is reduced to a small area in the center. The plant societies 
here form into zones, as in Station VII, though not with the same 
regularity (Fig. 3). There is a central portion (see Pl. XII.,2) which 
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FIGURE -3. 
Diagram showing relation of characteristic vegetation of Station 
XIV. The arrangement of Typha and Cephalanthus in distinct asso- 
ciations is noteworthy. 
Cephalanthus occidentalis. 
Typha latifolia. 
Iris versicolor. 
Quercus. 
Carya. 
Populus. 
Ulmus. 
WuUnNOoO @ x 
is open and free from vegetation. The north side and west end of 
the pond are occupied by button-bush. The edge is bordered by a 
zone of Iris. There is a zone of cattails (Typha latifolia) at the 
south side; the east end is shallow and is filled with swamp 
grass. 
The following trees occupy the area surrounding the pond: 
Quercus bicolor. Swamp White Oak. 
Cephalanthus occidentalis. Button-bush. 
Salix longifolia. River-bank Willow. 
Populus deltoides. Cottonwood. 
Populus tremuloides. Trembling Aspen. 
Ulmus americana. American Elm. 
Carya ovata. Shellbark Hickory. 
