Proceedings of the Columbus Horticultuml Society. 55 



SUMMARY OF SOURCES OF THE OHIO FLORA. 



Direction of Source. Ntunber of Species. Proportion to Stale Flora. 



From Northwest 27 1.4 per cent. 



From North 80 4.1 " " 



From Northeast 145 7.4 " " 12.9 per cent. 



From East 25 1.;^ " " 



From Southeast 18 0.9 " " 15.1 " " 



From South 122 6.2 " 



From Southwest 28 1.4 '' " 7.6 " " 



From West 38 2.0 " " 2.0 " " 



Naturalized 304 15.5 " " 15.5 " " 



787 40.2 



The composite character of the plants of Ohio is thus evi- 

 dent to any who may investigate the statistics of the area. 

 The northern elements are larger than any other determined 

 components. A study of the ranges of all plants found in the 

 state as to extent north or south beyond Ohio will possibly 

 increase the evidence heretofore offered in support of a 

 northern origin for much of our fllora. 



Yet interesting as floristic studies may prove, the physiologi- 

 cal adaptations of the plants to their present situations is 

 equally enticing, and on the whole, better adapted for many 

 reasons to meet the demands of both the local collector and 

 the laboratory investigator. The time is certainly ripe for 

 ecological studies in Ohio. 



SOME WORKS RELATING TO THE GEOGRAPHICAL DISTRIBUTION OF 

 NORTH AMERICAN PLANTS. 



(Manuals and General Floras not Included.) 



Real, Dr. W. J. — Geographical Distribution of the Grasses 



of North America. Proc. Amer. Assn. Adv. Sci. 



XXXIX. (1890). pp. 312-819. 

 Bentham, George. — Notes on the Classification, History and 



Geographical Distribution of Compositiv. Jour. Linn. 



Soc. Botany XIII. (1873), 335-577. 

 Bkitton, Prof. N. L.— On the Geographical Distribution of 



North American Plants. Proc. Amer. Assn. Adv. .Sci. 



XXXIX. (1890), 322-327. 



