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 nv;mber 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, GerarcUa, 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 aiTangement 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) 



