Hollick: Introduced Plants nkar Arlington '63 



by reason of the climatic conditions or the unfavorable environ- 

 ment. They served their original economic uses as food products, 

 and such of them as are represented in a further struggle for ex- 

 istence during a single season are of interest mainly as indicating 

 the vegetable resources that were utilized by the community as 

 part of its food supply. 



The plants of greatest botanical interest are those which origi- 

 nated from seeds brought in the ballast of vessels from foreign 

 ports, or in fodder and packing material in freight trains from 

 the south and west. ^lany of these become naturalized, and 

 remain as permanent additions to our flora. 



At our April meeting last year I exhibited and gave memoranda 

 on certain of the grasses and sedges collected at this locality and 

 I am now able to show some of the higher plants found associated 

 with them. Many of the species are common in waste places 

 elsewhere and do not call for special reference or discussion ; 

 others, however, are not only new to our local flora but have not 

 heretofore been reported from the eastern United States. For 

 this reason some difficulty was experienced in correctly identify- 

 ing them and a few yet remain undetermined. 



Following is a list of those which were collected as most char- 

 acteristic of the locality in the autumn. The species new to our 

 local flora are designated by an asterisk. 

 Comviclina nudiflora L.* 



Tropical America. Asia and Africa. 

 Chciiopodium aiitJicliiiinticuiii L.* 



Europe. Common in waste ground. 

 Chcnopodmm vidvaria F.* 



Europe. 

 Atriplcx patnia L. 



Europe. Common in waste ground. 

 Amaranthiis spiiiosiis F.* 



Tropical America. 

 Amaranthiis yraccizans F. 



Tropical America and western United States. Common in 

 waste ground. 



