VOL. VII, PP. 105-132 JUNE, 18 92 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. J 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, Althaea cannabina, Sida Napaea, Medi-cago maculata, Lespedeza striatq. Veronica agrestis and V. hederss-folia, Brunella laciniata, Panicum mttiaceum, 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. f Bulletin No. 22, U. S. National Museum, 1831. JWard, Proc. Biol. Soc., vol. II, 1885, pp. 84-87 ; Knowlton, ibid., vol. HI, 188(3, pp. 103-132. (105)
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