ADDITIONS TO THE FLORA OF WASHINGTON. 109 



S31A. Quercus alba x Prinus. 



On the Rockville Road a few rods north of Woodlev Park Road. 

 Discovered October 22, 18S2, by Prof. Ward. A large tree 

 standing just inside the fence on the west side of the road. 



832a. Quercus obtusiloba x alba. 



Discovered by Dr. Vasey by the roadside near Piney Branch, 

 September 20, 1882. 



836(7. Quercus Prinus x alba. Saul's Oak. 



Pointed out to Dr. Vasey by Mr. John Saul in his nursery, just 

 back of his residence, September 20. 1882. 



890^. Potamogeton crispus, L. 



Near mouth of Gravelly Run, Va., October 26, 1884. The 

 specimens seen were all without fruit. Prof. Ward and 

 the author. 



924^7. Allium sativum, L. English Garlic. 



Georgetown College grounds, July 22, 1S82. Prof. Ward. In 

 addition to this locality he found it below the Insane Asy- 

 lum, June, 1884. 



109317. Carex utriculata, Boott. 



Eastern Branch Marsh, June 8, 1879. These specimens were 

 confounded with those of C. rifiaria from the same locality, 

 and under that name sent to Mr. Walter Deane, of Cam- 

 bridge, who pointed out the error. 



noirt. Sporobolus vaginaeflorus, Torr. 



Monument Grounds, Sept. 12, 1885. Prof. Ward. 



j 10377. Agrostis canina, L. 



Vacant lots near B. & O. depot, July, 1S85. Prof. F. Lamp- 

 son Scribner. 



1 [2577. Eatonia obtusata. Gray. 



Collected by Dr. George Vasey, June, 1884. 



1 15377. Bromus tectorum, L. 



Kendall Green, July, 1S85. Prof. F. Lampson Scribner. 



1172a. Phalaris arundinacea, L. 



Collected on the Seventh street road by Dr. Geo. Vasey, June, 

 1S84. 



