Vol. XIV, pp. 47-86 JUNE 19, 1901 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



SIXTH LIST (3F ADDITIONS TO THE FLORA OF 

 WASHINGTON, D. C. AND VICINITY. 



BY EDWARD S. STEELE. 



With DescriptiojNts of New Species and Varieties by 



Edward L. Greene, Alvah A. Eaton, and 



THE Author. 



The following list is based upon a course of collecting prose- 

 cuted outside of my routine work for five years beginning with 

 1896. The general purpose has been merely to record names of 

 new and less familiar plants, with stations; but advantage has 

 been taken of the opportunity to publish a few descriptions of 

 new local material and to record some observations. 



Professor Greene has kindly furnished for publication here a 

 name and character for a new violet which I was so fortunate 

 as to discover. Mr. Alvah A. Eaton describes two new forms 

 of Isoetes, which are not, however, my own discoveries. I 

 propose a segregate from the Ijycopus virginicus of authors, a 

 well-marked species long since noticed, but apparently never 

 properly named. In an extended note on Yernonia (jlavca I 

 hope to have set that species in a somewhat clearer light. Other 

 notes are scattered through the list. ' 



I am indebted to several gentlemen for the revision of my 

 determinations, particularly to Mr. L. H. Dewey, who studied 

 all my earlier collections of grasses. The dichotomous Pani- 



}0— Biol. Soc. Wash. Vol. XIV, 1901. (47) 



