VOL. X, PP. 29-43 FEBRUARY 26, 1896 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON. 



FOURTH LIST OF ADDITIONS TO THE FLORA OF 

 WASHINGTON, D. C. 



BY THEO. HOLM.* 



The present paper is supplemental to Prof. Lester F. Ward's 

 1 Guide to the Flora of Washington and Vicinity.' f It con 

 stitutes the fourth addition, and I have followed the same prin 

 ciples of nomenclature and arrangement as in the above-cited 

 work of Professor Ward. I have also, in accordance with my 

 previous addition, J not only enumerated such species as are 

 new to the flora, and which are marked with an 'asterisk, but 

 have also included a number of the rarer species recorded from 

 new localities. 



In spite of the fact that comparatively few of the Washington 

 botanists are interested in the local flora, we have, nevertheless, 

 succeeded in accumulating a very considerable amount of ma 

 terial for the study of the geographical distribution of plants 

 within the limits of the flora. It is very interesting to see that 

 several of the plants that have been recorded as new in the later 

 additions are only new so far as concerns Professor Ward's flora. 

 Several of them were already recorded by Brereton in his Pro- 

 dromus, but not included in the list given by Professor W^ard. 



* Presented at a meeting of the Biological Society of Washington, No 

 vember 30, 1895. 



t Bulletin No. 22, U. S. National Museum, 1881. 

 J Holm, Theo. : Proc. Biol. Soc., vol. vii, 1892, pp. 105-132. 

 % Brereton, John A.: Florae Columbians Prodromus. Washington, 1830. 



5 BIOI,. Soc. WASH., VOL. X, 1896 (29) 



