54 



Proceedings of the Columbus Horticultural Society. 



A. Taraxacum Taraxacum — 



Eu-Asia 



A. Sonchus arvensis Eu- Asia 



A. Sonchus oleraceus Eu. 



A. Sonchus asper " 



Lactuca Scariola " 



Crepis tectorum " 



Crepis biennis " 



Hieracium aurantiacum " 



A. Xanthium spinosum. . Eu. or Asia 

 A. Xanthium strumarium " " 



(julierrezia Texana — 



S. Western U. S. 



Amphiachyris dracunculoides — 



.S. Western U. S. 



Grindelia squarrosa — 



Western U. S. 



Inula Heienium Eu.-Asia 



Parthenium hvsterophorus — 



:.S. Western U. S. 



Eclipta alba . Trop. Amer. 



Rudbeckia hirta. ..Western U. S. 

 A. Galinsoj^a parviflora . Trop. Amer. 

 Heienium nudiflorum — 



Western U. S. 



Heienium tenuifolium — 



Western U.S. 



Dysodia papposa . S, Western U. S. 

 A. Anthemis Cotula Eu. 



Anthemis arvensis Eu. 



Anthemis nobilis " 



Anthemis tinctoria Eu.-Asia 



Chrysanthemum Leucanthemum 

 Eu.-Asia 



A. Chrysanthemum Parthenium — 



.....Eu. 



Chrysanthemum Balsamita — 



Eu.-Asia-Afr. 



Matricaria Chamomilla Eu. 



Matricaria matricarioides — 



Pacific coast 



A. Tanacetum vulgare Eu. 



Artemisia Absinthium " 



Artemisia Abortanum " 



Artemisia annua Asia 



Artemisia vulgaiis Eu.-Asia 



Tussilago Farfara Eu. 



A. Senecio vulgaris " 



Arctium Lappa " 



Arctium minus " 



A. Carduus lanceolatus Eu.-Asia 



A. Carduus arvensis Eu. 



A. Onopordon Acanthium. Eu.-Asia 



Centaurea Cyanus Eu. 



Centaurea nigra " 



Centaurea Jacea " 



Cnicus benedictus S. Eu. 



The naturalized plant.s of Ohio number at present 304 

 species, of which 99 also flourish in Australia. With respect 

 to sources of these later migrants 145 are European, and 103 

 are common to Europe and Asia, 15 are indigenous in Asia 

 alone, while 22 are from western and south-western United 

 States, 15 from tropical America and a few from various other 

 countries. 



The tabulated species, including only those shown by the 

 summary table, constitute a little above 40 per cent, of the 

 flowering plants, ferns and fern allies known to grow spon- 

 taneously in Ohio. The larger number have such a wide range 

 that they have been at present omitted. The lists are collected 

 in the following summary table, the percentages being com- 

 puted upon the basis of approximately 1960 * species for Ohio : 



* Professor W. A. Kellerman writes that the new list of Ohio plants contains 

 2,025 numbers. This basis will change the percentages slightly. 



