VOL. VII, PP. 105-132 JUNE, 1892 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON. 



THIRD LIST. OF ADDITIONS TO THE FLORA OF 

 WASHINGTON, D. C. 



BY THEODOR HOLM * 



The following list is supplemental to Professor Lester F. 

 Ward's "Guide to the Flora of Washington and Vicinity, "f 

 since the publication of which two additional lists have been 

 issued.]; The present paper covers the period from April 1, 

 1886, to April 1, 1892. The species which are new to the flora 

 have been marked with an asterisk, but besides these many of 

 the rarer species have been included, with records of new local- 

 ities. The known flora has been increased by about 80 species 

 and varieties since the year 1886. Some of the plants that are new 

 to the District seem to have been accidentally introduced ; for 

 example : Silene noctiflora, Althdea cannabina, Sida Napsea, Medi- 

 cago maculata, Lespedeza striatq. Veronica agrestis and V. hederse- 

 folia, Bmnella laciniata, Panicum miliaceum, Hordeum pratense, 

 etc. The others, however, are species indigenous to the United 

 States which heretofore have been overlooked or which may 



* Presented at a meeting of the Biological Society of Washington, May 

 14, 1892. 



t Bulletin No. 22, U. S. National Museum, 1831. 



J Ward, Proc. Biol. Soc., vol. II, 1885, pp. 84-87 ; Knowlton, ibid., vol. 

 HI, 1881), pp. 103-132. 



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