VOL. XIV, PP. 7-22 APRIL 2, 1901 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON FIFTH LIST OF ADDITIONS TO THE FLORA OF WASHINGTON, D. C. BY THEO. HOLM. Five years have elapsed since the publication of my fourth list of additions to the local flora,* and it will be seen from the present paper that these five years of research have materially added to the number of species hitherto known to occur in the vicinity of Washington, in addition to which I have been able to record an extended range of many of the rarer species, for merly known from only a very few localities. Through Dr. E. L. Greene's painstaking studies of various genera, more particularly of Antennaria, Viola, Gerardia, etc., these genera now appear to contain a number of excellent species, which formerly had been entirely overlooked or more or less confused; some of these species have even proved to be very common within the District of Columbia. In order to facilitate the use of this additional list, I have, with only a very few exceptions, followed the nomenclature and arrangement of the orders as in the previously published additions, these hav ing been arranged in conformity with the fundamental work on the Flora, Lester F. Ward's "Guide to the Flora of Washing ton and Vicinity, "f *Proc. Biol. Soc. Wash. X, pp. 29-43, 1896. fBull. 22, U. S. Nat. Mus. 1881. 2 BIOL. Soc. WASH. VOL. XIV, 1901. (7)
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