200 THE AMERICAN MIDLAND NATURALIST 



of brush. Growing from the seeds, fruits, roots, stems and entire 

 plants, which were held by the brush, were found the largest 

 plants on the bank. 



8. Seeds of willow and poplar were carried in by the wind. 



9. The order of the succession after the recession of the water 



was Riccia >ruderal herbs and grasses > seedling 



willows and poplars >zone of young willows and poplars 



> flood plain forest of willows, poplars, and some elm, ash 



and S] camore. 



REFERENCES 



1. Braun, E. Lucy. The physiographic ecology of the Cin- 

 cinnati region. Ohio State Univ. Bull. 20; 1 16-2 11, 1916. P. 188. 



2. Clements, F. E- Plant Succession. Publ. 242, Carnegie 

 Insti. of Wash. Washington, D. C. 1916. 



3. Elmore, C. J. The first year's flora of a dried-up mill-pond. 

 Proc. Nebr. Acad. Sci. 7; 29. 1901. 



4. Soil survey of Nemaha County, Nebraska. Bur. of Soils, 

 U. S. Dept. of Agric. Washington, D. C. 1916. 



DESCRIPTION OF FIGURES. 



Fig. 1. — Deep cracks in alluvial clay caused by the evaporation of water. 

 Persicaria Pennsylvanica, Radicula palustris, Rumex crispiis, and Bidens 

 cernua are the more common plants. Vaucheria and diatoms form a green 

 lining over the damp walls of numerous cracks. 



Fig. 2. — Plants growing from seeds, fruits, stems, roots, or entire plants 

 caught by the brush. Salix cor data in background and S. interior in fore- 

 ground growing from branches. S. interior in center from a root. The other 

 plants are Panicum dichotomiflorum, Eguisetum at extreme right growing 

 from rootstocks, Persicaria lapathifolia, Bidens frondosa, and Xanthium 

 commune. 



Fig. 3. — Showing the deposition of brush on the shore just beyond the 

 reach of the waves. Large quantities of seeds and fruits were held in the 

 brush. 



Fig. 4. — The seeds, deposited as shown in Fig. 3., have given rise to 

 these water level zones. The most abundant plants are Cyperus erytkrorhdzos, 

 Bidens cernua, and B. frondosa. Other plants are Salix interior, Populus 

 deltoides, Rumex crispus, Verbesina alba, Radicula palustris and Potentilla 

 paradoxa. 



