Abstract
The affinities of the flora of any region are the product of past geologic and climatic history and of present edaphic and climatic conditions. A change in any of the above will bring about shifts or migrations of floras. The present geographic distribution of a species, though in the main a reflection of existing climatic and edaphic conditions, may be due in part to past migrations. The f'lora of Ohio can be explained only if these dynamic agents are taken into consideration. In the past there has been a series of migrations of unrelated floristic elements depending upon the changing conditions. The persistence of a species after there has been a modification of any of the causal factors, has led to the intermingling of different elements in our flora.
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