Proceedi?igs of the Columbus Horticultural Society. 



39 



Geranium Robertianum, Arctostaphylos Uva-Ursi, 



Polygala cruciata, Lithospermum hirtum, 



Polyg^la polygania, Melampyrum lineare, 



Euphorbia polygonifolia, Lonicera oblongifolia, 



Viola lanceolata, Artemisia Canadensis. 

 Proserpinaca palustris, 



The marine species of our flora are found on the lake shores 

 and beach sands. Many of the typical species are found 

 throughout the great lakes. Many boreal plants grow in this 



Typical Species of the Calcareous Region. 



Kraunhia frutescens; 

 Meibomia lUinoensis, 

 Ceanothus oratus, 

 Dodecatheon Meadia, 

 Verbena bracteosa, 

 Clinopodium glabrum, 

 Lactuca pulchella, 

 Solidago Ohioensis, 

 Aster azureus, 

 Leptilon divaricatum. 



Thuja occidentalis, 

 Triglochin palustris, 

 Sporobolus heterolepis, 

 Eatonia obtusata, 

 Kouleria cristata, 

 Bromus Kalmh, 

 Cladium maris€oides, 

 Carex siccata, 

 Trillium nivale, 

 Erysimum asperum, 

 Potentilla fruticosa, 



The greater number of the typical species for the western 

 region are southwestern and western in range. The eastward 

 limitation of a large number of species is noted by Moseley 

 in his Sandusky Flora now in press. It must appear to all that 

 this is the least satisfactory of the typical lists. 



WHENCE CAME THE PLANTS OF OHIO? 



Taking the Ohio Flora as a whole, we may properly con- 

 sider it in the light of its sources, or origin, as indicated by 

 the range of its species. 



The identity of many genera and species of the North 

 American Flora, with those of Europe and Eastern Asia was 

 long the subject of careful investigation by Dr. Asa Gray 

 (I, II, III, IV). A study of his work must not be omitted if 

 we would become familiar with the elements of our Flora, con- 

 sidered in this relation. He has shown (II and IV) that in 

 the number of identical genera and species of forest trees the 

 Flora of the Atlantic United .States approaches more nearly 

 to that of Eastern Asia than to the Pacific Slope. After dis- 

 cussing the striking differences in the present forests of 

 Europe and Western America on the one hand, compared with 

 those of the Atlantic United States and Eastern Asia on the 

 other, he continues as follows (IV, 188): "Extending the 

 comparison to shrubs and herbs it more than appears that the 



